Add basic KMS key endpoints.

tests/test_kms/test_server.py

@@ -0,0 +1,25 @@
+from __future__ import unicode_literals
+
+import json
+import sure  # noqa
+
+import moto.server as server
+from moto import mock_kms
+
+'''
+Test the different server responses
+'''
+
+
+@mock_kms
+def test_list_keys():
+    backend = server.create_backend_app("kms")
+    test_client = backend.test_client()
+
+    res = test_client.get('/?Action=ListKeys')
+
+    json.loads(res.data.decode("utf-8")).should.equal({
+        "Keys": [],
+        "NextMarker": None,
+        "Truncated": False,
+    })