UI: Delete Manage Media function from action list

V1 -> V2:
Have the "ui/css/theme-default/guest-media.css" deleted

Have the "Manage Media" function deleted from "Action" list

Signed-off-by: Wen Wang <wenwang@linux.vnet.ibm.com>
Allow admin user change permission settings when VM is running

V1 -> V2:
Have the "edit" button in interface tab deleted when VM is running

Functions changed:
1) Enable "Edit" whether VM is running or off
2) Disable edit function of "General", "Storage", "Interface" except
"replace" of the cdrom under "Storage".

Signed-off-by: Wen Wang <wenwang@linux.vnet.ibm.com>