rhel: Add timeouts to network scripts.

rhel: Add timeouts to network scripts.

If the daemon(s) aren't running for whatever reason, the RHEL ovs
ifup/ifdown scripts don't take that into account and an attempt to reboot a
system could take forever. (literally. endless loop!)  Here are a couple of
patches (one of ifup, one for ifdown) to add timeouts (10 seconds), because
it runs per interface you have configured and that could take awhile to
reboot a system if needed.

Signed-off-by: Brian Kruger <bkruger+ovsdev@gmail.com>
[blp@nicira.com fixed up a conflict against master]
Signed-off-by: Ben Pfaff <blp@nicira.com>