Use custom PHP runtime for PHPUnit execution in autotest

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

autotest.sh

@@ -395,8 +395,8 @@ function execute_tests {
 		echo "No coverage"
 	fi
 
-	echo "${PHPUNIT[@]}" --configuration phpunit-autotest.xml $GROUP $COVER --log-junit "autotest-results-$DB.xml" "$2" "$3"
-	"${PHPUNIT[@]}" --configuration phpunit-autotest.xml $GROUP $COVER --log-junit "autotest-results-$DB.xml" "$2" "$3"
+	echo "$PHP" "${PHPUNIT[@]}" --configuration phpunit-autotest.xml $GROUP $COVER --log-junit "autotest-results-$DB.xml" "$2" "$3"
+	"$PHP" "${PHPUNIT[@]}" --configuration phpunit-autotest.xml $GROUP $COVER --log-junit "autotest-results-$DB.xml" "$2" "$3"
 	RESULT=$?
 
 	if [ "$PRIMARY_STORAGE_CONFIG" == "swift" ] ; then