LU-11607 tests: replace lustre_version/fstype - large-lun

LU-11607 tests: replace lustre_version/fstype - large-lun

The routine get_lustre_env() is available to all Lustre test
suites and sets environment variables for the Lustre version
installed on servers and clients.

Replace calls to lustre_version_code() and facet_fstype()
for all server types with definitions from get_lustre_env()
for the large-lun, lfsck-performance, sanity-selinux and
scrub-performance test suites.

While doing this, replace ‘$SINGLEMDS’ with ‘MDS1_VERSION’
in lustre_version_code() and facet_fstype().

Test-Parameters: trivial fstype=ldiskfs testlist=sanity-selinux,scrub-performance
Test-Parameters: fstype=zfs testlist=ldiskfs testlist=sanity-selinux,scrub-performance
Test-Parameters: fstype=ldiskfs testlist=large-lun,lfsck-performance
Test-Parameters: fstype=zfs testlist=ldiskfs testlist=large-lun,lfsck-performance
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Ie1a04103b8d721ab20992ed0a9afb3a399270937
Reviewed-on: https://review.whamcloud.com/36380
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>