test/runtests.sh: don't print skipped tests at the end

This is also just unnecessary noise, particularly if you often have
many devices/files in your test list. Then you get an entry for each one
and it ends up being pages long.

There's no information here that cannot be gleaned from just looking at
skipped tests individually.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/runtests.sh

@@ -156,10 +156,6 @@ for tst in "${TESTS[@]}"; do
 	fi
 done
 
-if [ -n "$SKIPPED" ]; then
-	echo "Tests skipped: $SKIPPED"
-fi
-
 if [ -n "$TIMED_OUT" ]; then
 	echo "Tests timed out: $TIMED_OUT"
 fi