Allow testing of MySQL and PostgreSQL scenario locally

This leverage pifpaf to start MySQL or PostgreSQL temporarily and allow to test
provisioning directly without being on OpenStack CI by adding new tox
targets:

- py27-mysql
- py27-postgresql
- py34-mysql
- py34-postgresql
- py27-all
- py34-all

These targets will start MySQL or PostgreSQL before running the tests,
while exporting the connection string to $PIFPAF_URL. The `all' target
will start both MySQL and PostgreSQL and will run the tests against
these backends, plus SQLite.

Also, this patches add OS_TEST_DBAPI_ADMIN_CONNECTION to be allowed to
be passed through tox. This allows to run the opportunistic tests on a
more persistent pifpaf database, for example by running tox with:

$ eval `pifpaf -g OS_TEST_DBAPI_ADMIN_CONNECTION run postgresql`
$ echo $OS_TEST_DBAPI_ADMIN_CONNECTION
postgresql://localhost/postgres?host=/var/folders/7k/pwdhb_mj2cv4zyr0kyrlzjx40000gq/T/tmpMGqN8C&port=9824
$ tox -e py27
[…]
$ tox -e py34
[…]
$ kill $PIFPAF_PID

Change-Id: I1ee582e6f96e98378f02be79f4aaff0f447a062a
Depends-On: Id3e6b694bb186724517599cd9875ad80ceeee053

1 files changed, 2 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index e3f1012..741413d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -48,6 +48,8 @@ test =
 fixtures =
   testresources>=0.2.4 # Apache-2.0/BSD
   testscenarios>=0.4 # Apache-2.0/BSD
+pifpaf =
+  pifpaf>=0.1.0
 
 [files]
 packages =