Raise VipExists exception in case Vip is created or updated
for a pool that already has a Vip

fixes bug 1158049

Change-Id: I258a31f5d54c040ed478ab241b0e90f2bd0f69b3
Imported Translations from Transifex

Change-Id: Ifd232d5588da1882e4d0a6e946e8d55738153bff
Revert back to 'call' for agent reports

Fixes bug 1159581

The logic of the agents is based on RPC call()
since the agent needs to catch an exception over RPC.

Change-Id: I6d408216ebdfd130bab2555e61febd02b521985d
Merge "Imported Translations from Transifex"
Merge "Raise VipExists exception in case Vip is created or updated for a pool that already has a Vip"