Feature-9518: Scale-in/Scale-out commands triggered from the UI

 * In NS Instances page. Click "Manual Scaling" in the actions menu.
 * Then a new pop-up page will opened.
 * In the popup there will be a list box which is filled with the all scaling-group-descriptor names captured from all VNFDs in the NSD and whoose scaling-type is "manual".
 * Select scale in / scale out.
 * When the scaling-group-descriptor name and the scaling direction are selected then Click Apply button.
 * The pop-up window is closed and the page is directed to "History of operations" page for this NS.

Change-Id: Iaaa1500bcabea4ebda89f6c11ea91b28396aa42f
Signed-off-by: Barath Kumar R <barath.r@tataelxsi.co.in>