LU-10047 tests: stop skipping test_102 subtests

LU-10047 tests: stop skipping test_102 subtests

Remove obsolete version check on tar.
All tar versions in supported distros are now capable of --xattrs.
But not all tar version have --xattrs-include, so must test for and
adapt for that.

Lustre-commit: 036641a1e1f6d5d010873267b669528890f19fe4
Lustre-change: https://review.whamcloud.com/29288

Test-Parameters: trivial envdefinitions=ONLY=102 testlist=sanity
Test-Parameters: trivial clientdistro=el6.9 envdefinitions=ONLY=102 testlist=sanity
Test-Parameters: trivial clientdistro=sles12sp2 envdefinitions=ONLY=102 testlist=sanity

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: I5e76bd1a762c4e01cf8a3a33789ca3a30c15abb0
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-on: https://review.whamcloud.com/29823
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>