LU-11010 tests: remove calls to return after skip()

LU-11010 tests: remove calls to return after skip()

The skip() routine now contains a call to exit. All calls
to skip() and skip_env() should be reviewed and calls to
return that followed skip should be removed.

A problem with the skip message not being printed is corrected.

Test-Parameters: trivial testlist=sanity-pfl
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I1a52e9bd79a71de4ab4c0cea9c569f379115a603
Reviewed-on: https://review.whamcloud.com/32346
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>