rh_perf_envsetup.sh: fix disable/stop services

The services to disable are difference with the services to stop,
it should be same.

smartd is stopped twice, so sort services alphabetically to avoid
duplicates.

Signed-off-by: Amos Kong <akong@redhat.com>
Merge pull request #947 from kongove/for-lmr-rhperf

update rh_perf_envsetup.sh