EUCA-7075
Add custom validator to match one of the passed array of instance IDs.
Merge branch 'maint/3.3/testing' into EUCA-7075
EUCA-7075
Validation:
- instance_id required and one of the passed in array of instance IDs
- volume_id required and one of the passed in array of unattached volume IDs
- ensure that the passed-in list of volumes to validate against are unattached
- validate on submit and report errors, instead of nagging with every keypress
Merge branch 'EUCA-7075' into maint/3.3/testing