webadmin: Manage network dialog- replace VM network checkbox with icon

VM network = True => green VM icon is shown
VM network = False => no icon is show

Change-Id: Ie96e3f173b0b510f1b8f20c9e9649eb937054d1a
Bug-Url: https://bugzilla.redhat.com/1016636
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>