LU-11607 tests: replace lustre_version/fstype in sanity-scrub

LU-11607 tests: replace lustre_version/fstype in sanity-scrub

The routine get_lustre_env() is available to all Lustre test
suites and sets an environment variable for the Lustre
version and file system types of servers.

In sanity-scrub, sanity-hsm and sanity-lfsck, replace calls
to lustre_version_code() and facet_fstype() for all server
types with definitions from get_lustre_env().

Clean up around any modifications by removing calls to
return after skip() or skip_env().

Fixes: c8790ae52393 (LU-1538 tests: standardize test script init - dne-part-2)
Fixes: c54b6ca2bdb5 (LU-13718 tests: add LU numbers to skipped tests)
Test-Parameters: trivial fstype=ldiskfs testlist=sanity-scrub,sanity-hsm,sanity-lfsck
Test-Parameters: fstype=zfs testlist=sanity-scrub,sanity-hsm,sanity-lfsck
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: I5aa2898f6efef127cf2d7f4a2f08838f503c51ab
Reviewed-on: https://review.whamcloud.com/35929
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: Vikentsi Lapa <vlapa@whamcloud.com>