Remove "-t -t" -- is this causing us to hang?

TBR=epoger
BUG=skia:1329

Review URL: https://codereview.chromium.org/197763009

site_config/slave_hosts_cfg.py

diff --git a/site_config/slave_hosts_cfg.py b/site_config/slave_hosts_cfg.py
index b168d97..4bc5e5c 100644
--- a/site_config/slave_hosts_cfg.py
+++ b/site_config/slave_hosts_cfg.py
@@ -44,10 +44,8 @@
 
 def skia_lab_login(hostname, config):
   """Procedure for logging into SkiaLab machines."""
-  # The multiple "-t"s are needed in order to force tty allocation, which gives
-  # us the expected interactive behavior, even with two levels of SSH.
   return [
-    'ssh', '-t', '-t', '%s@%s' % (SKIALAB_USERNAME, SKIALAB_ROUTER_IP),
+    'ssh', '%s@%s' % (SKIALAB_USERNAME, SKIALAB_ROUTER_IP),
     'ssh', '%s@%s' % (SKIALAB_USERNAME, config['ip'])
   ]