Replace tests.base part4

It is the fourth step to replace using ceilometer.tests.base with
openstack.common.test.
In this patch is changed for using
openstack.common.test and added needed fixtures in
test classes.

Change-Id: I584db92369ecb8c787b1c669cdeb2ac7fe9ddfb3
Replace tests.base part5

It is the fifth step to replace using ceilometer.tests.base with
openstack.common.test.
In this patch is changed for using
openstack.common.test and added needed fixtures in
test classes.

Change-Id: Ic7bed465f499f8546b86899f3345001bd16a9193
Imported Translations from Transifex

Change-Id: Iffa241f6a728b869131b7232ce8e5f8338eb83c1
Merge "Replace tests.base part4"
Merge "Replace tests.base part5"
Merge "Imported Translations from Transifex"