releasenotes: add notes for Mitaka cycle

Change-Id: I8b25f4cf2e1039769442e1aa82e3c196035dc1d3

releasenotes/notes/apache_ports-5d0eb0ca775ad7d1.yaml

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+---
+features:
+  - Allow Apache http/https ports to be configurable.

releasenotes/notes/keystone_v3-d381e37592d3b29b.yaml

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+---
+features:
+  - Use keystone v3 with horizon by default.

releasenotes/notes/remove_lesscpy-b4b677de57351078.yaml

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+---
+deprecations:
+  - Remove installation of lesscpy package, not needed since Horizon has been using pyscss.

releasenotes/notes/root_url-cede3a4a7ecafdf9.yaml

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+---
+features:
+  - Making root_url configurable.
+    This needs to occur to allow people the ability to serve Horizon from the
+    root of a vhost.

releasenotes/notes/trigger_collectstatic-fb465ebec48b3bc7.yaml

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+---
+features:
+  - Leave an ability to trigger collectstatic for debian/ubuntu.

releasenotes/notes/update_local_settings_mitaka-f182327ce660fda0.yaml

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+---
+features:
+  - Update of local_settings template from Mitaka.