GUI-1346 Adjust the initialization of the previously used security groups on the instance launch and launch config wizards.

, and also while working on it, it was discovered that the create launch config path was only including one security group when clicked from the instance pages (GUI-1366). This issue was addressed in this pull request as well.
https://eucalyptus.atlassian.net/browse/GUI-1346
https://eucalyptus.atlassian.net/browse/GUI-1366