test: l2fwd: improve runner script failure detection

Currently, even if runner script fails to parse the maximum pps value
from `odp_l2fwd` test log (e.g. the searched pattern is not found or
value is not numerical), runner script reports success.

Improve this by checking that the parsed value is actually found and is
an integer. This should help if the searched pattern somehow changes
without additionally updating the runner script.

Signed-off-by: Tuomas Taipale <tuomas.taipale@nokia.com>
Reviewed-by: Matias Elo <matias.elo@nokia.com>

test/performance/odp_l2fwd_run.sh

@@ -91,7 +91,12 @@ run_l2fwd()
 			PASS_PPS=10
 		fi
 		MAX_PPS=$(awk '/TEST RESULT/ {print $3}' $LOG)
-		if [ "$MAX_PPS" -lt "$PASS_PPS" ]; then
+		NUMREG='^[0-9]+$'
+		echo "PARSED PPS: $MAX_PPS"
+		if ! [[ $MAX_PPS =~ $NUMREG ]]; then
+			echo "FAIL: cannot parse $LOG"
+			ret=1
+		elif [ "$MAX_PPS" -lt "$PASS_PPS" ]; then
 			echo -e "\nodp_packet_gen"
 			echo "=============="
 			cat $GEN_LOG