Track security group provisioned by Heat

Reasons:
 - Trove doesn't track security group that was created as
   a part of Heat stack.
 - Trove should create two records:
   - security groups itself (security groups table);
   - security group association to an actual instance;

Changes:
 - Adding security groups registration right after stack creation.

Change-Id: I1f55c27ecbd5ad76c869eae7197b8c24720fc1e6
Closes-Bug: #1276228