Final batch of release notes for Mitaka-3

This patch adds some release notes in preparation for the mitaka-3
release.

Change-Id: Ia87f4509f0bf40c481c6838c604138a99b548ec9

releasenotes/notes/action-status-check-fe5d7ccbc18e317e.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Reworked action status check so that a cluster action will always return
+    from WAITING status.

releasenotes/notes/affinity-policy-c7dcb2e5fca6354b.yaml

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+---
+features:
+  - Added senlin.policy.affinity-v1.0 which can be used to control how VM 
+    servers are placed based on nova servergroup settings.

releasenotes/notes/deletion-policy-doc-e7e95f260b7a2470.yaml

@@ -0,0 +1,3 @@
+---
+other:
+  - Added documentation for senlin.policy.deletion-v1.0.

releasenotes/notes/health-check-3d0f1bcd8e76c9cd.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - New health check daemon is introduced to do periodical cluster status
+    checking. It collaborates with health policy on cluster monitoring.

releasenotes/notes/lb-based-health-d628938567f5824f.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Added LBaaS health monitor support to load-balancing policy v1.0.

releasenotes/notes/multi-tenancy-bb6a7288c9c55fd0.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Enforce multi-tenancy checking when a non-admin user attempting to list
+    resources from projects other than that of the requesting user.

releasenotes/notes/trust-id-usage-ca1196ae51b7fa04.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Fixed trust usage when interacting with keystone. This enables senlin to
+    be deployed on a Juno version OpenStack.