Implementation of core AWS Media Live endpoins (#3428)

* Initial attempt to mock AWS Media Live create_channel endpoint. Test fails.

* Completes basic implementation of Media Live create_channel endpoint

* Completes basic implementation of Media Live list_channels endpoint

* Adds skaffolds for describe_channel and delete_channel

* Adds unit test for delete_channel

* Adds unit test for describe_channel

* Reduces repetitive code by introducing a Channel model

* Implements MediaLive start_channel and stop_channel endpoints

* Fixes lack of support for the dash character in resource ARNs

* Implements MediaLive update_channel endpoint.

* Implements MediaLive create_input endpoint (and Input model).

* Implements MediaLive describe_input endpoint.

* Implements MediaLive list_inputs endpoint.

* Implements MediaLive update_input endpoint.

* Addse server tests for MediaLive

* Adds further url patterns for medialive

* Fixes url patterns

* Fixes url patterns

tests/test_medialive/test_server.py

@@ -0,0 +1,32 @@
+from __future__ import unicode_literals
+
+import sure  # noqa
+
+import moto.server as server
+from moto import mock_medialive
+
+"""
+Test the different server responses
+"""
+
+
+@mock_medialive
+def test_medialive_list_channels():
+    backend = server.create_backend_app("medialive")
+    test_client = backend.test_client()
+
+    res = test_client.get("/prod/channels")
+
+    result = res.data.decode("utf-8")
+    result.should.contain('"channels": []')
+
+
+@mock_medialive
+def test_medialive_list_inputs():
+    backend = server.create_backend_app("medialive")
+    test_client = backend.test_client()
+
+    res = test_client.get("/prod/inputs")
+
+    result = res.data.decode("utf-8")
+    result.should.contain('"inputs": []')