engine: Extract RemoveNetworksByLabelParametersBuilder

The class will be used to detach networks from host
when networks is removed from a cluster.

Change-Id: Ib95c94ddb121449b5032b9d30f755b3b1771aa3a
Related-To: https://bugzilla.redhat.com/1055188
Signed-off-by: Moti Asayag <masayag@redhat.com>