LU-3514 tests: combine dependent sanity tests

The tests 27c, 77c, 77e, 77h are skipped when previous
dependent test is not ran.

This patch combines the following sanity tests:
    tests 27b, 27c to test 27b
    tests 77b, 77c to test 77b
    tests 77d, 77e to test 77d
    tests 77g, 77h to test 77g
For the 77* tests $tfile is used for test file name.

Signed-off-by: Elena Gryaznova <elena_gryaznova@xyratex.com>
Xyratex-bug-id: MRP-983
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I945442326237f8ed5225f1b31bb06fac1b40f28e
Reviewed-on: http://review.whamcloud.com/6784
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>