webadmin: Hide profiles tab if network is non-VM

A non-VM network cannot have profiles associated with it, so the
profiles tab of the add/edit network dialog is now hidden whenever the
VM network checkbox isn't marked. If the network is non-VM, then
whatever's in the (hidden) profiles tab is ignored.

Change-Id: I0cb1d77310a88c58d89b997e6fb7a974d06b009e
Bug-Url: https://bugzilla.redhat.com/1007286
Signed-off-by: Lior Vernia <lvernia@redhat.com>