Release notes for RC1 release

This patch adds release notes for the RC1 release.

Change-Id: Ice6e3638818cda41f95b1491779fa750a7277c75

releasenotes/notes/cluster-node-dependents-3bdbebd773d276d1.yaml

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+---
+features:
+  - Added dependents to clusters and nodes for recording other clusters/nodes
+    that depend on them.

releasenotes/notes/cluster-node-status-e7fced162b415452.yaml

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+---
+fixes:
+  - Fixed cluster/node status setting after a cluster/node check operation.

releasenotes/notes/doc-fixes-cd8c7006f8c66387.yaml

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+---
+fixes:
+  - Various fixes to the user doc, developer doc and API documentation.

releasenotes/notes/metadata-query-profile-9c45d99db7b30207.yaml

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+---
+fixes:
+  - Removed 'metadata' from profile query parameters because the current
+    support is known to have issues.

releasenotes/notes/nova-server-validation-60612c1185738104.yaml

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+---
+features:
+  - The 'image', 'flavor', 'key_name' and 'networks' properties of a
+    nova server profile can now be validated via profile-validate API.

releasenotes/notes/nova-update-opt-7372e4d189e483aa.yaml

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+---
+features:
+  - Optimized nova server update so that password and server name can be
+    updated with and without image-based rebuild. 

releasenotes/notes/nova-update-validation-dca7de984c2071d1.yaml

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+---
+fixes:
+  - Added validation of key_name, flavor, image, networks when updating nova
+    server.

releasenotes/notes/receiver-create-trust-bd5fdeb059e68330.yaml

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+---
+fixes:
+  - Fixed bugs related to receiver creation when type is set to 'message'.

releasenotes/notes/remove-bdm-v1-4533677f3bca3c5d.yaml

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+---
+deprecations:
+  - Deprecate 'block_device_mapping' from nova server profile since it was
+    never supported by OpenStack SDK.