LU-12214 build: fix make rpms

LU-12214 build: fix make rpms

Disable an mpi tests if host don't have any MPI implementation
installed.

libselinux should a soft dependence and rpm able to handle it
internally,

Change-Id: I09eaa825a086dd349699de287222e8dc14d1fd1a
Signed-off-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-on: https://review.whamcloud.com/37954
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Shuichi Ihara <sihara@ddn.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>