Release notes for newton-3 milestone

This patch adds release notes for the newton-3 milestone.

Change-Id: I31be9ae6c980c7477589e50ccda9531455d78272

releasenotes/notes/cli-deprecation-241b9569b85f8fbd.yaml

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+---
+other:
+  - The 'senlin' CLI will be removed in April 2017. This message is now
+    explicitly printed when senlin CLI commands are invoked.

releasenotes/notes/cluster-collect-a9d1bc8c2e799c7c.yaml

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+---
+features:
+  - A new command 'senlin cluster-collect' and its corresponding OSC plugin
+    command has been added. This new command can be used to aggregate a
+    specific property across a cluster.

releasenotes/notes/cluster-policy-list-42ff03ef25d64dd1.yaml

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+---
+fixes:
+  - The cluster policy list command was broken by new SDK changes and then
+    fixed. The 'enabled' field is now renamed to 'is_enabled'.

releasenotes/notes/cluster-run-210247ab70b289a5.yaml

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+---
+features:
+  - A new CLI command 'senlin cluster-run' and a new OSC plugin command
+    'openstack cluster run' have been added. Use the 'help' command to find
+    out how to use it.

releasenotes/notes/deletion-output-a841931367a2689d.yaml

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+---
+features:
+  - The senlin CLI 'node-delete' and the OSC plugin command
+    'cluster node delete' now outputs the action IDs when successful. Error
+    messages are printed when appropriate.

releasenotes/notes/micro-version-a292ce3b00d886af.yaml

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+---
+features:
+  - The senlinclient now supports API micro-versioning. Current supported
+    version is 'clustering 1.2'.

releasenotes/notes/policy-validate-193a5ebb7db3440a.yaml

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+---
+features:
+  - A policy-validate command has been added to senlin command line.
+    OSC support is added as well.

releasenotes/notes/profile-validate-587f1a964e93c0bf.yaml

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+---
+features:
+  - A profile-validate command has been added to command line. It can be
+    used for validating the spec of a profile without creating it.

releasenotes/notes/python-3.5-c9fd8e34c4046357.yaml

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+---
+features:
+  - The support to python 3.5 has been verified and gated.

releasenotes/notes/receiver-create-8305d4efbdf35f35.yaml

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+---
+other:
+  - The receiver creation command (both senlin CLI and OSC plugin command)
+    now allow 'cluster' and 'action' to be left unspecified if the receiver
+    type is not 'webhook'.