releasenotes: add notes for Mitaka cycle

Change-Id: Ia94646a859482a27519f2da39871ce010df75e55

releasenotes/notes/deprecate_alarm-273cc49b689fe0a8.yaml

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+---
+deprecations:
+  - Deprecate Ceilometer alarm classes.
+    Alarming services (evaluator and notifier) in Mitaka
+    were moved to Aodh OpenStack project.

releasenotes/notes/deprecate_old_mongo-5909886c13013bde.yaml

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+---
+deprecations:
+  - Deprecate mongodb_replica_set parameter.

releasenotes/notes/gnocchi-22478d430337227c.yaml

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+---
+features:
+  - Implement Gnocchi dispatcher configuration
+    Add dispatcher options to ceilometer::collector and
+    create ceilometer::dispatcher::gnocchi class, with current
+    upstream options.

releasenotes/notes/keystone_auth-b821f96e020f9048.yaml

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+---
+deprecations:
+  - Use identity_uri and auth_uri by default.

releasenotes/notes/pymysql-e57bf1f0289dd426.yaml

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

releasenotes/notes/remove_qpid-0b446db43fdea617.yaml

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+---
+deprecations:
+  - Remove QPID messaging support.
+    Qpid messaging driver is removed from oslo.messaging so we won't support
+    anymore.

releasenotes/notes/workers-2ce7d757e90b0c84.yaml

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+---
+features:
+  - Ability to configure api, collector and notification workers.