engine: Adjust setupNetworks message on tasks view

The previous message of setupNetworks was related to a specific
network where this is not the case of setupNetworks which might
handle several networks (or none).

Change-Id: I33ebbc4541e57d41e60e6a05d6d83172ead35d00
Bug-Url: https://bugzilla.redhat.com/905175
Signed-off-by: Moti Asayag <masayag@redhat.com>