GUI-292: Various fixes for Create Launch Configuration wizard per UX feedback

Implemented in this pull request…

- Hide summary section for each step until the respective step is visited
- Modify Next buttons to just display "Next"
- Display  rules for selected security group.
- Fix image picker to display appropriate icon if platform is unknown (the "power button" icon).

Note:
- Launch configurations do allow an instance_monitoring boolean flag, so that field was left in the wizard.