TBR: veyron/tools/servicerunner: increase timeout.

The Readline command would time out when the Mac slave is too busy (it
has two executors unlike the linux slaves which only have one executor).

(Sorry, I couldn't submit go/vcl/2634 for some reason. Submitting this one instead)

Change-Id: I1cfe24b306cd7abf6f99b0c0e98134823ff9d5ef
diff --git a/tools/servicerunner/main.go b/tools/servicerunner/main.go
index 225e19a..3e0b345 100644
--- a/tools/servicerunner/main.go
+++ b/tools/servicerunner/main.go
@@ -33,7 +33,7 @@
 	}
 	numLeft := len(varsToAdd)
 
-	s := expect.NewSession(nil, h.Stdout(), 10*time.Second)
+	s := expect.NewSession(nil, h.Stdout(), 30*time.Second)
 	for {
 		l := s.ReadLine()
 		if err := s.OriginalError(); err != nil {