LU-4551 tests: add range support in ONLY

LU-4551 tests: add range support in ONLY

Add range support in ONLY, so we can indicate
the range of test cases when running the test.

For example ONLY="12-30" sh sanity will run sanity
test case 12 until 30.

Test-Parameters: allwaysuploadlogs envdefinitions=ONLY="12-20" testlist=sanity
Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I4c6dd62f0524ece388ccde3f1e4469a1219f11d2
Reviewed-on: http://review.whamcloud.com/9022
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>