When a new GRE tunnel is created OVS agent calls ovs-vsctl
incorrectly. Command:
sudo ovs-vsctl --timeout=2 --may-exist add-port br-tun gre-1
is produced instead of correct one:
sudo ovs-vsctl --timeout=2 -- --may-exist add-port br-tun gre-1
Fixes bug 1227675
Change-Id: I010961658a37028e41621c4a529b5a14e7587c7f