ovsdb-tool.at: Drop monitor argument

ovsdb-tool.at: Drop monitor argument

This patch drops the '--monitor' argument when running the ovsdb-server.

This can potentially increase the bug detection since the process will not
be restarted in certain situations.

Also, fixes the test under Windows since daemons do not have '--monitor'
argument.

Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>
Suggested-by: Ben Pfaff <blp@ovn.org>
Suggested-at: https://mail.openvswitch.org/pipermail/ovs-dev/2018-April/346135.html