veyron/lib/modules: Extend timeout to make the shell less flaky on jenkins.

Change-Id: I6e385c58993f2822bed37d33db9e93639beeef0f
diff --git a/lib/modules/exec.go b/lib/modules/exec.go
index 5d63b4a..20137b1 100644
--- a/lib/modules/exec.go
+++ b/lib/modules/exec.go
@@ -160,7 +160,7 @@
 	if err := handle.Start(); err != nil {
 		return nil, err
 	}
-	err = handle.WaitForReady(time.Second)
+	err = handle.WaitForReady(10 * time.Second)
 	return eh, err
 }