Remove OVSDB disconnect from the cluster test

Remove OVSDB disconnect from the cluster test

Current Get Cluster Entity Owner For Ovsdb keyword does not work
when there is more than one ovs instance connected or the same
instance reconnects (ovs uses a different uuid).

This is a short term fix, real fix is to get the ovs uuid
just after ovs connects to controller and use this uuid to
interrogate a new implementation of the entity owner keyword.

Also changing Connect Remote System -> Connet Mininet when applies.

Change-Id: I39fcfc062e4135afd821e56a40c142c6b2f61542
Signed-off-by: Luis Gomez <ecelgp@gmail.com>