Update buildbot_tool and builders.pyl templates to remove 'master_type'.

masters/master.tryserver.client.catapult/builders.pyl

Index: masters/master.tryserver.client.catapult/builders.pyl
diff --git a/masters/master.tryserver.client.catapult/builders.pyl b/masters/master.tryserver.client.catapult/builders.pyl
index 4a4382d04f6d52084509117fc06b792c4598fed7..7dd9abb837e8094d5fe0285e492cef99bf36e856 100644
--- a/masters/master.tryserver.client.catapult/builders.pyl
+++ b/masters/master.tryserver.client.catapult/builders.pyl
@@ -21,7 +21,6 @@
   "master_classname": "CatapultTryserver",
   "master_port": 21400,
   "master_port_alt": 41400,
-  "master_type": "tryserver",
   "service_account_file": "service-account-chromium-tryserver.json",
   "buildbucket_bucket": "master.tryserver.client.catapult",
   "slave_pools": {
@@ -52,4 +51,4 @@
   },
   "slave_port": 31400,
   "templates": ["../master.chromium/templates"],
-}
+}