LU-6857 tests: TF_FAIL is not initialised

LU-6857 tests: TF_FAIL is not initialised

TF_FAIL is initialised in auster only,
this leads to t-f failure "touch: missing file operand"
if the suites run not under auster control.
DEFAULT_SUITES is initialised in acceptance-small only,
this leads to garbage summary message printed.

Patch adds export TF_FAIL to init_test_env() and
skips useless summary printing for the case when suites run
not under acceptance-small control.

Signed-off-by: Elena Gryaznova <elena.gryaznova@seagate.com>
Xyratex-bug-id: MRP-2116
Reviewed-by: Vladimir Saveliev <vladimir.saveliev@seagate.com>
Change-Id: I047aae3b7c6f7d75e98e7862a7f00fd2d75d8b1f
Reviewed-on: http://review.whamcloud.com/15617
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>