ovs-ctl: Permit to specify additional options

ovs-ctl: Permit to specify additional options

Currently using ovs-ctl is not possible to specify additional options
for ovs-vswitchd and ovsdb-server (for example to specify a different
loglevel during daemon startup).

This patch adds --ovs-vswitchd-options and --ovsdb-server-options
options to ovs-ctl in order to specify the additional options.

Due to word splitting it may not be possible to specify an option that
includes whitespaces.

Reported-at: https://bugzilla.redhat.com/1664794
Reported-by: Matt Flusche <mflusche@redhat.com>
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>