releasenotes: add notes for Mitaka cycle

Change-Id: Id17b7005ebd6305921e207a49672758e9084b958

releasenotes/notes/api_paste-b94e191896840944.yaml

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+---
+features:
+  - Add api_paste type/provider.

releasenotes/notes/client-04f70664e363425c.yaml

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+---
+features:
+  - Implement ::gnocchi::client.

releasenotes/notes/db_upgrade-2eff712611fa34ba.yaml

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+---
+upgrade:
+  - Update db-sync command to use gnocchi-upgrade.

releasenotes/notes/influxdb-889413086f27c7e4.yaml

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+---
+features:
+  - Add Influxdb as a backend storage.

releasenotes/notes/keystone_auth-557bfe055fd9101d.yaml

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+---
+features:
+  - Enable correct auth pipeline when keystone is enabled.
+    Use gnocchi+auth in the main pipeline when we want to use keystone
+    authentification.

releasenotes/notes/metricd-dd917b15aa827654.yaml

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+---
+features:
+  - Add metricd service support.

releasenotes/notes/pymysql-e57bf1f0289dd426.yaml

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