LU-13485 kernel: Parallel core configure tests

LU-13485 kernel: Parallel core configure tests

Transform the compile tests in lustre-core to run in parallel

Lustre-change: https://review.whamcloud.com/38361
Lustre-commit: a346cf6cf22c285e05177a5a5e70a7d8e5bd9fa8

LU-16586 build: Remove old check for linux_selinux_enabled

LC_SRC_HAS_LINUX_SELINUX_ENABLED is used and not defined, it
should be removed.

LC_PROG_LINUX_SRC and LC_PROG_LINUX_RESULTS are defined twice,
remove the unused ones.

Lustre-change: https://review.whamcloud.com/50111
Lustre-commit: 2bdff20f97707cf05118e822adf202ccb209e3a5

Fixes: a346cf6cf22 ("LU-13485 kernel: Parallel core configure tests")

Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I46fa852659eb4db86a12ec4ad3efddd0fdd3a655
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/50976
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: Shuichi Ihara <sihara@ddn.com>
Reviewed-by: Shuichi Ihara <sihara@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>