completed JIRA ASGARD-1281
AppRegistration instances without group should be added to the DEFAULT_BLANK_GROUP group
simplify group removal conditional
change default group to blank instead of null

> fix improper key sorting
Merge pull request #482 from danveloper/hotfix/HOTFIX-ASGARD-1273-SOME-APPS-NOT-SHOWING

AppRegistration instances without group should be added to a default group
removed all code associated with EBS volumes for instance types
fixed unused import
Merge pull request #481 from aglover/ASGARD-1281

completed JIRA ASGARD-1281