Add in TEST_MAPPING for acloud unittests.

Bug: 124250384
Test: atest
Change-Id: I0f4f0560ba1fb5f8ac1d7937301aceda15106711
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..61a80b2
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,8 @@
+{
+  "presubmit" : [
+    {
+      "name" : "acloud_test",
+      "host" : true
+    }
+  ]
+}