Updated openstack/openstack
Project: openstack-infra/devstack-gate  283281496039966eda4058328dea7785dc23d7fa
null
Fedora/RHEL DB updates for devstack_gate.sh

If you're using Fedora or Red Hat in your jenkins server,
It will always fail when check the database, because
on Fedora, the path for postgres and mysql directories
are different from Ubuntu.
This will check which distro are being used and check
the right path.

Change-Id: Ib1df1c9be92ce5a506caa5b36b69dfab32d9a99f