Use tcp listener during qa tests

This keeps tests from interfering with each other
if running in parallel.

Author: ajbouh

src/qa_test/qa_flaky_test.go

@@ -44,6 +44,8 @@ func TestDetectFlaky(t *testing.T) {
 		"-suite-label", "my-flaky-suite",
 		"-suite-coderef", "r1",
 		"-archive-base-dir", dir,
+		"-listen-network", "tcp",
+		"-listen-address", "127.0.0.1:0",
 		"rspec",
 		"minitest:test/minitest/**/test*.rb",
 		"test-unit:test/test-unit/**/test*.rb",

src/qa_test/qa_run_test.go

@@ -17,6 +17,8 @@ func runQa(dir string) (*testutil.Transcript, error) {
 	var err error
 	tscript.Stderr, err = testutil.RunQaCmd(run.Main, visitor, dir, []string{
 		"-format=tapj",
+		"-listen-network", "tcp",
+		"-listen-address", "127.0.0.1:0",
 		"rspec",
 		"minitest:test/minitest/**/test*.rb",
 		"test-unit:test/test-unit/**/test*.rb",