Handle NoMoreFixedIps in _shutdown_instance.

Bug 1192893

If no fixed ips is found, continue to perform the rest of the instance
shutdown, instead of propogating the exception.

Steps to reproduce:
1. Create a network
2. Reserve all fixed ips of the network
3. Try to create an instance but failed
4. Try to delete the instance

Results:
Cannot delete the instance due to the 'NoMoreFixedIps' exception.

Change-Id: I42776c427773f1f81c16062a9aaa54850ec68bfd
Imported Translations from Transifex

Change-Id: I784dd0d466f0d2173e0c7d0763dc06522ca82c3a
Merge "Handle NoMoreFixedIps in _shutdown_instance."
Merge "Imported Translations from Transifex"