Remove unused import

Module exception from glance.common in
glance.tests.unit.v2.test registry api module seems to
be unused, so it's import can be safely removed.

Change-Id: Ifc201c6fb1226e556d4217898844e04069d81932
Merge "Remove unused import"
Put formatting operation outside localisation call

Otherwise the strings will not be properly extracted
for translation.

Change-Id: I21a1c56577e7cd9fb2e31fe380b3c3bc8d1c48bf