EUCA-7757
- Remove policy arn from list of alarm actions when the policy is deleted.
- Also noticed that the alarm name in the selector when first initialized doesn't commit to the model when the policy is added - first policy added always has an empty alarm. Fixed here too.
Merge pull request #135 from eucalyptus/EUCA-7757

EUCA-7757 - Remove policy ARN from alarm actions list when policy is destroyed.