Merging Bug Fixes and Style Changes w.r.t Server Manager
- Added async option to contrailAjaxHandler
- Added default step methods to ContrailWizard
- Added more headerControl Options
- Fixed wizard steps to show check sign on completion of all the sub steps
- Added padding for the section elements which are not part of accordion
- Style changes for lock element on server-manager
- Added margin and padding related styles

Change-Id: I6131a0b9b3d9c322ff932649f01b79bc2b3d8412