veyron/lib/modules, veyron/tools/servicerunner: Start the test identityd
server in the servicerunner.

This CL adds a new module "test_identityd" for running the test identityd
server.

The servicerunner now starts the test identityd server.

Small cleanups to the servicerunner and wspr modules.

Change-Id: Ic066eefce3061541b98ddad914c1798248aa1f55
diff --git a/tools/servicerunner/servicerunner_test.go b/tools/servicerunner/servicerunner_test.go
index 5a7b24f..57cd8f7 100644
--- a/tools/servicerunner/servicerunner_test.go
+++ b/tools/servicerunner/servicerunner_test.go
@@ -39,7 +39,15 @@
 	vars := map[string]string{}
 	check(t, json.Unmarshal(line, &vars))
 	fmt.Println(vars)
-	for _, name := range []string{"VEYRON_CREDENTIALS", "MT_NAME", "PROXY_ADDR", "WSPR_ADDR"} {
+	expectedVars := []string{
+		"VEYRON_CREDENTIALS",
+		"MT_NAME",
+		"PROXY_ADDR",
+		"WSPR_ADDR",
+		"TEST_IDENTITYD_ADDR",
+		"TEST_IDENTITYD_HTTP_ADDR",
+	}
+	for _, name := range expectedVars {
 		if _, ok := vars[name]; !ok {
 			t.Error("Missing", name)
 		}