Fix environment variables printed by run_emulators

Change-Id: Id87ab35c5f33c3bbeb7f483ec6d784718b9e1eaf
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/234496
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/scripts/run_emulators/run_emulators.go b/scripts/run_emulators/run_emulators.go
index 64d8779..0fefd73 100644
--- a/scripts/run_emulators/run_emulators.go
+++ b/scripts/run_emulators/run_emulators.go
@@ -117,7 +117,7 @@
 		time.Sleep(5 * time.Second)
 		fmt.Println("Emulators started. Set environment variables as follows:")
 		for _, e := range emulators {
-			fmt.Println(fmt.Sprintf("export %s=%s", e.env, e.port))
+			fmt.Println(fmt.Sprintf("export %s=localhost:%s", e.env, e.port))
 		}
 		select {}
 	} else {