rhel: Fixed a bug for checking the correct major version and revision.

rhel: Fixed a bug for checking the correct major version and revision.

Fixed a bug where checking for major version 3.10 and major revision not
equal to 327 or 693 or 957 should have gone to the default else at the end.
In the current code, the default else condition will not get executed
for kernel with major version 3.10 and major revision not equal
to 327/693/957 resulting in failure to load the kernel module.

Fixes: 402efbe4e176 ("rhel: Add 4.12 kernel support in ovs-kmod-manage.sh")
Signed-off-by: Ashish Varma <ashishvarma.ovs@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>