If using the '--keep-going' option, zdtm prints out an overview how many
tests were run, failed and skipped. This would also be useful to know if
it did not fail. This patch changes the output like this:

 ################## ALL TEST(S) PASSED (TOTAL 297/SKIPPED 36) ###################

or in the case of a failure it is unchanged:

 ################### 2 TEST(S) FAILED (TOTAL 297/SKIPPED 34) ####################
  * zdtm/static/sched_policy00(ns)
  * zdtm/static/cgroup02(h)
 ##################################### FAIL #####################################

Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>