Remove dependent module py3kcompat

Module py3kcompat was removed from oslo-incubator, we can use
six directly.

Change-Id: I6c4266b71312ae53ecaedbd2ce1a865e60eb8d50
Closes-Bug: #1280033
Cast the quota set values to integer before checking their validity

Change-Id: I56409607d435a5e2ff702ccb9f19c5d12b432570
Closes-Bug: #1280159
Imported Translations from Transifex

Change-Id: Id20fd023c69d84a929f432304ab15e6c80c81b3b
Merge "Remove dependent module py3kcompat"
Merge "Cast the quota set values to integer before checking their validity"
Merge "Imported Translations from Transifex"