Return 1 if any tests failed so that the build farm can pick it up.

testsuite/master.test

@@ -90,3 +90,10 @@ echo "      $failed failed"
 echo "      $skipped skipped"
 echo "      $missing missing"
 echo '------------------------------------------------------------'
+
+if test $failed -gt 0
+then
+    exit 1
+else
+    exit 0
+fi