[ussuri][goal] Drop python 2.7 support and testing3.0.0

OpenStack is dropping the py2.7 support in ussuri cycle.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Switch to using modern sphinx-build.
Remove cruft from setup.cfg

Drop non-voting jobs from gate queue.

Change-Id: I2cc764bd3de8130aa25868b57b2e89341c71617e

7 files changed, 20 insertions, 47 deletions

diff --git a/.zuul.yaml b/.zuul.yaml
index 39fc353..d653cf9 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -1,27 +1,21 @@
 - project:
     templates:
       - check-requirements
-      - lib-forward-testing
       - lib-forward-testing-python3
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - openstack-tox-functional
         - openstack-tox-functional-py36
         - tempest-smoke-py3-osprofiler-redis
         - tempest-smoke-py3-osprofiler-sqlalchemy
     gate:
       jobs:
-        - openstack-tox-functional
         - openstack-tox-functional-py36
-        - tempest-smoke-py3-osprofiler-redis
-        - tempest-smoke-py3-osprofiler-sqlalchemy
 
 - job:
     name: tempest-smoke-py3-osprofiler-redis
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 481b456..ffd70a2 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -2,7 +2,6 @@ coverage===4.0
 ddt===1.0.1
 dulwich===0.15.0
 elasticsearch===2.0.0
-futures===3.0.0
 jaeger-client==3.8.0
 mock===2.0.0
 netaddr===0.7.18
diff --git a/releasenotes/notes/drop-python-2-7-73d3113c69d724d6.yaml b/releasenotes/notes/drop-python-2-7-73d3113c69d724d6.yaml
new file mode 100644
index 0000000..0554c61
--- /dev/null
+++ b/releasenotes/notes/drop-python-2-7-73d3113c69d724d6.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. The minimum version of Python now
+    supported by osprofiler is Python 3.6.
diff --git a/setup.cfg b/setup.cfg
index 6030a25..22b42ae 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/osprofiler/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Developers
@@ -13,30 +14,20 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
 
 [files]
 packages =
     osprofiler
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [extras]
 oslo_config =
   oslo.config>=5.2.0 # Apache-2.0
 
-[build_sphinx]
-all_files = 1
-build-dir = doc/build
-source-dir = doc/source
-warning-is-error = 1
-
 [entry_points]
 oslo.config.opts =
     osprofiler = osprofiler.opts:list_opts
@@ -44,6 +35,3 @@ console_scripts =
     osprofiler = osprofiler.cmd.shell:main
 paste.filter_factory =
     osprofiler = osprofiler.web:WsgiMiddleware.factory
-
-[wheel]
-universal = 1
diff --git a/setup.py b/setup.py
index ddd1771..a7c1710 100644
--- a/setup.py
+++ b/setup.py
@@ -14,14 +14,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
-    setup_requires=['pbr>=1.8'],
+    setup_requires=['pbr>=2.0'],
     pbr=True)
diff --git a/test-requirements.txt b/test-requirements.txt
index 9153e9e..33a3fb3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0
+hacking>=2.0,<=2.1  # Apache-2.0
 
 coverage>=4.0 # Apache-2.0
 ddt>=1.0.1  # MIT
@@ -25,4 +25,3 @@ reno>=2.5.0 # Apache-2.0
 
 # For Jaeger Tracing
 jaeger-client>=3.8.0 # Apache-2.0
-futures>=3.0.0;python_version=='2.7' or python_version=='2.6' # PSF
diff --git a/tox.ini b/tox.ini
index 8601286..aee1fcc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,12 @@
 [tox]
-minversion = 2.0
-skipsdist = True
-envlist = py27,py37,pep8
+minversion = 3.1.0
+# Needed to create ChangeLog for docs building
+skipsdist = False
+envlist = py37,pep8
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en
@@ -12,13 +15,11 @@ deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
-install_command = pip install -U {opts} {packages}
 usedevelop = True
 commands = stestr run --slowest {posargs}
 distribute = false
 
 [testenv:functional]
-basepython = python2.7
 setenv = {[testenv]setenv}
          OS_TEST_PATH=./osprofiler/tests/functional
 deps =
@@ -28,10 +29,10 @@ deps =
 [testenv:functional-py36]
 basepython = python3.6
 setenv = {[testenv:functional]setenv}
-deps = {[testenv:functional]deps}
+deps =
+  {[testenv:functional]deps}
 
 [testenv:pep8]
-basepython = python3
 commands =
   flake8
   # Run security linter
@@ -39,11 +40,9 @@ commands =
 distribute = false
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     PYTHON=coverage run --source osprofiler --parallel-mode
 commands =
@@ -53,11 +52,10 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-basepython = python3
-commands = python setup.py build_sphinx
+commands =
+  sphinx-build -W --keep-going -b html -d doc/build/doctrees doc/source doc/build/html
 
 [testenv:bandit]
-basepython = python3
 commands = bandit -r osprofiler -n5
 
 [flake8]
@@ -69,11 +67,9 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,setup.py,build,releasen
 local-check-factory = osprofiler.hacking.checks.factory
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt