Big Switch: Retry on 503 errors from backend

Retries requests to the backend controller up to 3
additional times with 3 seconds in between each request
if a 503 service unavailable message was returned.
The scenarios that return 503 messages from floodlight
are normally short lived locks for things like OpenStack
synchronization or upgrade blocks. Retrying should work
in the majority of cases.

Closes-Bug: #1357105
Change-Id: Ifacd3a384cfc797ba6d6af5f3c8649c333473259
Imported Translations from Transifex

Change-Id: I72ae6c5d543baea1c11c3e0b31359d4af898dd2b
Merge "Imported Translations from Transifex"
Merge "Big Switch: Retry on 503 errors from backend"
Merge branch 'master' of https://github.com/openstack/quantum