webadmin:  Non-VM networks not being detached from cluster

Non-vm network property wasn't cloned when cloning network.
It caused some bugs-
- The user couldn't detach non-vm network from the cluster.
- Non-VM networks shown as VM networks on cluster attachment dialog.

Change-Id: I69415097f4c7d253225cb57f545df398b36d0261
Bug-Url: https://bugzilla.redhat.com/906291
Bug-Url: https://bugzilla.redhat.com/906289
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>