Add quiet mode for test runner(s) (#2228)

In one of the previous PR we have encountered a problem,
where the Travis cuts off the test execution
as the generated log file is too big.

By adding a quiet mode for the test runners, we will
only report the failing tests.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com

tools/runners/run-unittests.sh

@@ -17,6 +17,13 @@
 DIR="$1"
 shift
 
+VERBOSE=1
+if [ "$1" == "-q" ]
+then
+    unset VERBOSE
+    shift
+fi
+
 UNITTEST_ERROR=$DIR/unittests.failed
 UNITTEST_OK=$DIR/unittests.passed
 
@@ -76,7 +83,7 @@ do
 
         failed=$((failed+1))
     else
-        echo "[$tested/$total] $cmd_line: PASS"
+        test $VERBOSE && echo "[$tested/$total] $cmd_line: PASS"
 
         echo "$unit_test" >> $UNITTEST_OK