Add a prelude to the Stein release notes

This patch adds a prelude to the stein release notes and fixes some
formatting issues in previous Stein release notes.

Change-Id: Ic0e8d9e70eb61ef471304ecfd9985c8da0725b3d

releasenotes/notes/Add-Stein-Prelude-7d8290b803db8c56.yaml

@@ -0,0 +1,23 @@
+---
+prelude: |
+    For the OpenStack Stein release, the Octavia team is excited to announce
+    support for: Octavia flavors, TLS client authentication, backend
+    re-encryption, and object tags.
+
+    * Octavia flavors allow an operator to define "flavors" of load balancers,
+      such as "active-standby" or "single" using the amphora driver, that
+      configure the load balancer topology. The Amphora driver also supports
+      specifying the nova compute flavor to use for the load balancer amphora.
+    * TLS client authentication allows the listener to request a client
+      certificate from users connecting to the load balancer. This certificate
+      can then be checked against a CA certificate and optionally a certificate
+      revocation list. New HTTP header insertions allow passing client
+      certificate information to the backend members, while new L7 rules
+      allow you to take custom actions based on the content of the client
+      certificate.
+    * Backend re-encryption allows users to configure pools to initiate TLS
+      connections to the backend member servers. This enables load balancers
+      to authenticate and encrypt connections from the load balancer to the
+      backend member server.
+    * Object tags allow users to assign a list of strings to the load balancer
+      objects that can then be used for advanced API list filtering.

releasenotes/notes/add_tag_support-4735534f4066b9af.yaml

@@ -3,10 +3,10 @@ features:
   - |
     Added tags property for Octavia resources. It includes:
 
-      * Load balancer
-      * Listener
-      * Member
-      * Pool
-      * L7rule
-      * L7policy
-      * Health Monitor
+    * Load balancer
+    * Listener
+    * Member
+    * Pool
+    * L7rule
+    * L7policy
+    * Health Monitor

releasenotes/notes/bug-1797130-8c9bfa50d9b6c955.yaml

@@ -3,9 +3,9 @@ features:
   - |
     Listeners default timeouts can be set by config in section haproxy_amphora:
 
-     * `timeout_client_data`: Frontend client inactivity timeout
-     * `timeout_member_connect`: Backend member connection timeout
-     * `timeout_member_data`: Backend member inactivity timeout
-     * `timeout_tcp_inspect`: Time to wait for TCP packets for content inspection
+    * `timeout_client_data`: Frontend client inactivity timeout
+    * `timeout_member_connect`: Backend member connection timeout
+    * `timeout_member_data`: Backend member inactivity timeout
+    * `timeout_tcp_inspect`: Time to wait for TCP packets for content inspection
 
-     The value for all of these options is expected to be in milliseconds.
+    The value for all of these options is expected to be in milliseconds.