[VOL-5009] - Update release notes

[VOL-5061]

overview/releases.rst
---------------------
  o Correct start/end release dates for v2.10-v2.12 to reflect reality.

release_notes/voltha_2.12.rst
-----------------------------
  o Populate the onos apps grid with versioned artifact and VCS urls.
  o Component kafka the only holdout

howto/release/checklist.rst
howto/release/components/index.rst
howto/release/index.rst
howto/release/voltha-docs/index.rst
howto/release/voltha-docs/release_notes.rst
howto/release/branching/
howto/release/components/igmpproxy/
howto/release/components/kafka/
howto/release/components/maclearner/
howto/release/components/pppoeagent/
howto/release/voltha-docs/release_history.rst
---------------------------------------------
  o Add more random content and links for release dependencies and tasks.

Change-Id: I31338488a4e626a97435429a36e200d54cf6267e
diff --git a/howto/release/components/kafka/index.rst b/howto/release/components/kafka/index.rst
new file mode 100644
index 0000000..113f6a4
--- /dev/null
+++ b/howto/release/components/kafka/index.rst
@@ -0,0 +1,21 @@
+ONOS Component: mcast
+=====================
+
+Repository: kafka-onos (ssh://gerrit.opencord.org:29418/kafka-onos)
+App: kafka
+
+Dependencies (pom.xml)
+----------------------
+
+- sadis
+- onlab-junit
+
+Dependencies (Maven plugins)
+----------------------------
+
+- spotbugs-maven-plugin  v4.7.3.4
+- findsecbugs-plugin     v1.12.0
+- `org.apache.servicemix.bundles.kafka-clients <https://mvnrepository.com/artifact/org.apache.servicemix.bundles/org.apache.servicemix.bundles.kafka-clients>`_
+
+  - 3.4.0_1
+  - 1.1.1_1