Add cts/gts to postsubmit

Add statsd cts and gts tests to post submit.

Test: treehugger
Bug: 159720126
Change-Id: I80ab336f8a2cf0e2a5d4a485cd2c04d23d81cdf9
diff --git a/apex/TEST_MAPPING b/apex/TEST_MAPPING
index 93f1087..331fe77 100644
--- a/apex/TEST_MAPPING
+++ b/apex/TEST_MAPPING
@@ -6,5 +6,14 @@
     {
       "name" : "LibStatsPullTests"
     }
+  ],
+
+  "postsubmit" : [
+    {
+      "name" : "CtsStatsdHostTestCases"
+    },
+    {
+      "name" : "GtsStatsdHostTestCases"
+    }
   ]
 }