Remove warn log for over quota

Over quota exception is already raised at API layer
and no need to print a warning log.

Change-Id: If44d5f2dd0e11d15d57cf6ab247f5e9e7fe75a9c
Make the coding style consistent with other Controller in plugins/v3

Add ALIAS and authorize as a global variable.

Change-Id: I6bc995008206d033ac4ac1e81c6954e999262861
Fix FloatingIP.save() passing FixedIP object to sqlalchemy

This prevents the FloatingIP.save() method from passing the
calculated FixedIP object to the sqlalchemy floating_ip_update()
function, which would expect it to be an SA object. It also
aborts any attempt to save the object with a modified fixed_ip_id
linkage, as associate/disassociate should be used for that.

This also fixes a bug where FloatingIP expects the result of
floating_ip_update() to be a FloatingIp SA object.

Change-Id: I065caedf4d81c8583a3b390934a1d403cf2e87bd
Closes-bug: #1334164
Merge "Fix FloatingIP.save() passing FixedIP object to sqlalchemy"
Merge "Make the coding style consistent with other Controller in plugins/v3"
Merge "Remove warn log for over quota"