Remove support for command hooks

distutils2 is long dead and many of its best ideas have been
incorporated into setuptools. One of the ideas that *has not* been
incorporated is the idea of command hooks, of either the pre or post
kind. pbr is still carrying the code for this, and there are several
issues with this:

- No one is using this functionality in OpenStack and, given the
  complete lack of documentation on the matter, it's very doubtful that
  it's being used anywhere else [1]
- It's causing issues for projects attempting to hook into the
  'distutils.commands' entry point on Python 2.7, which it seems no else
  must have attempted yet [2].
- distutils2 is dead and advanced features like this that we don't
  explicitly need should not be retained

We could attempt to fix this but why bother? Good riddance, I say.

[1] http://codesearch.openstack.org/?q=pre_hook%5C.&i=nope&files=&repos=
[2] http://codesearch.openstack.org/?q=distutils.commands&i=nope&files=&repos=

Change-Id: I01f657034cffbf55ce830b7e8dbb6b3d94c1fd18

1 files changed, 6 insertions, 0 deletions

diff --git a/releasenotes/notes/remove-command-hooks-907d9c2325f306ca.yaml b/releasenotes/notes/remove-command-hooks-907d9c2325f306ca.yaml
new file mode 100644
index 0000000..c6ce753
--- /dev/null
+++ b/releasenotes/notes/remove-command-hooks-907d9c2325f306ca.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Support for entry point command hooks has been removed. This feature was
+    poorly tested, poorly documented, and broken in some environments.
+    Support for global hooks is not affected.