Modify property errors are now propagated to client - EUCA-8806

The euca-modify-property command will now fail with an error when a
property change fails.

EUCA-8806
Network configuration property validation improvements - EUCA-8806

EUCA-8806
Use services fault log for user facing services - EUCA-8836

EUCA-8836
Fix client-token filter for EC2 instances - EUCA-8866

EUCA-8866
Merge remote-tracking branch 'origin/dev/sjones/EUCA-8806' into testing
Merge remote-tracking branch 'origin/dev/sjones/EUCA-8836' into testing
Merge remote-tracking branch 'origin/dev/sjones/EUCA-8866' into testing