EUCA-7267
- Don't render to the DOM until you need to be in the DOM.
- Don't keep making new copies of yourself, even though your're already in the DOM.
- Clean up after yourself on close.
EUCA-7267
- Break up dialog creation into separate create/edit/delete functions,
 so you only get the one you're interested in and don't make duplicates
 in the DOM.
- No need to close the dialog in _addIngressRule.
Merge pull request #51 from eucalyptus/EUCA-7267

EUCA-7267 - Stop security group dialog from making duplicates in the DOM and preserving tags from previous runs.