Use remove_warnings from puppet-keystone

Glance client is getting the same warnings as Keystone client,
hence puppet-glance should use the same hack as puppet-keystone
until providers will be refactored to use API calls instead.

See https://bugzilla.redhat.com/show_bug.cgi?id=1043725 for more details

Change-Id: I99e4308d0731307c019ad6cab8db5feee1b0ed73
(cherry picked from commit 9bc8d08681d6fdf1bbe682625ea9500118f21e3b)
Merge "Use remove_warnings from puppet-keystone" into stable/havana