Add a test for compos_key_service.

Also disabled testOdrefresh, until the memory size issue is resolved.

Add both tests to TEST_MAPPING.

Also gratuitously changed a few things.

Bug: 193603140
Test: atest ComposHostTestCases
Change-Id: I655153fda6792df5f2d0210dedb12fc3ab692af7
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 69d4568..d8b294b 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,7 +2,11 @@
   "presubmit": [
     {
       "name": "MicrodroidHostTestCases"
+    },
+    {
+      "name": "ComposHostTestCases"
     }
+
   ],
   "postsubmit": [
     // TODO(jiyong): promote this to presubmit. That currently doesn't work because