Remove openstack.common.gettextutils module

Remove obsolete module from glance.

With the dependent change I84511ab1ee600e618985448dfbfbdc26cb130370,
Glance do not use obsolete modules from oslo-incubator anymore.

Closes bug: #1381870
Change-Id: I3c0441bcffffe671cf974dc7af14cbac66709d85
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
Merge "Remove openstack.common.gettextutils module"