releasenotes: add notes for Mitaka cycle

Change-Id: Ia8af988292fca1e122b5fcb2e8ab208ee57be461

releasenotes/notes/admin_param-3cf729b707a3abcd.yaml

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+---
+fixes:
+  - Change default admin_user and admin_tenant_name.
+    To match with other modules change admin_user to murano and admin_tenant_name to
+    service.

releasenotes/notes/cloudfoundry-6f274f6bdc48274e.yaml

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+---
+features:
+  - Add ability to deploy Murano CloudFoundry service broker API.

releasenotes/notes/glare_api-f04ed81aadbb8904.yaml

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+---
+features:
+  - Add new options to communicate with Glare API.

releasenotes/notes/keystone_versionless-34e97ee844df80ba.yaml

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+---
+features:
+  - Use Keystone endpoint with version-less, to use Keystone v3 when available.

releasenotes/notes/pymysql-e57bf1f0289dd426.yaml

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+---
+features:
+  - Support of PyMySQL driver for MySQL backend.

releasenotes/notes/syncdb-2cead6e859c38cb7.yaml

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+---
+upgrade:
+  - Replace deprecated syncdb command to use migrate for Dashboard database.