Remove warning filter
Remove warning filter

Warning filter was enabled while fixing Launchpad bug #1516020 and later
when deprecation unused exceptions were removed, warning filter wasn't
removed due to which when glance_store is used by other projects, it
emits DeprecationWarning messages continuously.

This patch removes the unwanted warning filter.

Change-Id: Ibf227d509e567ccbcf77676277300511de2ad14d
Closes-Bug: #1844462

openstack/glance_store,openstack/glance_store