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rhel: make openvswitch service start return when ready
In OVS 2.6 openvswitch systemd service was changed to use BindsTo instead of Requires for sub-services but also removed them from After This made main openvswitch service return before sub-services were ready breaking scripts which assumed everything is ready after systemctl start e.g. in OpenStack CI infra  is calling ovs-vsctl immediately after service start exposing a race in virtualized CI environment: 2017-02-09T23:11:12.498Z|00007|bridge|INFO|ovs-vswitchd (Open vSwitch) 2.6.1 but ovs-ctl tried to access it few msec too early: 2017-02-09 23:11:12.352493 | ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory) Solution is to add ordering dependencies, BindsTo/Requires do not ensure it   https://github.com/openstack-infra/devstack-gate/blob/c435a724bd257b22a2e39e8e9125c11302a8c81d/functions.sh#L1057-L1078  https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requires= Fixes: 84ad120 ("rhel: Improved Systemd Integration") Signed-off-by: Alan Pevec <email@example.com> Acked-by: Aaron Conole <firstname.lastname@example.org> Signed-off-by: Russell Bryant <email@example.com>
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