fedora: Handle upgrades from rhel package.

fedora: Handle upgrades from rhel package.

Currently we have rhel/openvswitch.spec.in that provides
sysv scripts. The fedora package provides systemd scripts.
If one upgrades openvswitch package from sysv to systemd,
you will end up in a situation where old OVS daemons are
running, but systemd does not know about it.  One "restart"
is needed for systemd to see the old daemons. Another "restart"
or "force-reload-kmod" is needed to actually use the new
daemons.

This commit, just takes care of the first restart. The "real"
restart/force-reload-kmod will still have to be done outside
the package installation.

Signed-off-by: Gurucharan Shetty <guru@ovn.org>
Acked-by: Ansis Atteka <aatteka@ovn.org>