webadmin: Added InfoIcon for "public" profile checkbox

In the add/edit VM dialog, the "public" checkbox in the profiles tab
isn't explained, added an InfoIcon for it.

Change-Id: I244fbe01be7df305af837aff3ec6c09beec4e36b
Bug-Url: https://bugzilla.redhat.com/1000804
Signed-off-by: Lior Vernia <lvernia@redhat.com>