[VOL-5061] - docs.voltha.org: Update release page.On branch dev-joey

[VOL-5079]

conf.py
sphinx_conf/exclude_patterns.py
sphinx_conf/linkcheck_ignore.py
-------------------------------
  o Refactor large URL and path exclusion lists into separate files.
  o Update linkcheck release_notes/*.html patterns to exclude by regex.

release_notes/voltha_2.12.rst
-----------------------------
  o Update deployed package grid with current version strings.
  o Re-arrange structure to display 'artifacts', include links
    for pkg, pkg-app and pkg-api artifact downloads.
  o Replace sonatype/nexus urls(staging) with direct links to maven central.

requirements.txt
----------------
  o Added missing python package sphinx-reload.

howto/release/components/apache-karaf/
howto/release/components/atomix/
howto/release/components/onos/
--------------------------------------
  o Capture dependencies, version upgrades and sources to endit
    for current package release deployments.

To view changes live:
  o git checkout voltha-docs
  o cd voltha-docs
  o make reload

Change-Id: I7b88f9d4d3329abcbe98ebbb4dbb94587088f8b9
diff --git a/sphinx_conf/linkcheck_ignore.py b/sphinx_conf/linkcheck_ignore.py
new file mode 100644
index 0000000..a4f5b8f
--- /dev/null
+++ b/sphinx_conf/linkcheck_ignore.py
@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# -----------------------------------------------------------------------
+
+
+# -- Options for linkcheck ---------------------------------------------------
+# The link checker strips off .md from links and then complains
+linkcheck_ignore=\
+    [
+        r'https://github.com/opencord/voltctl/blob/master/LICENSE',
+        r'https://github.com/ciena/kind-voltha#voltha-up-configuration-options',
+        r'https://www.sphinx-doc.org',
+        r'https://github.com/opencord/bbsim/blob/master/docs/source/DMI_Server_README',
+        r'https://github.com/opencord/voltha-helm-charts/blob/master/README',
+        #
+        r'https://github.com/atomix/atomix/releases/tag/atomix-3.1.9',
+        r'https://github.com/atomix/atomix/releases/tag/atomix-3.1.8',
+        #
+        r'../voltha-helm-charts/README.html',
+        r'https://mvnrepository.com/artifact/org.slf4j/slf4j-api',
+        r'https://mvnrepository.com/artifact/org.mockito/mockito-all',
+        r'https://mvnrepository.com/artifact/com.h3xstream.findsecbugs/findsecbugs-plugin',
+        r'https://mvnrepository.com/artifact/com.github.spotbugs/spotbugs-maven-plugin',
+    ]
+
+linkcheck_ignore.extend([
+
+    # [RELEASE: generated html from rst
+    r'../release_notes/voltha_\d+.\d+.html',
+
+    # [RELEASE: Maven artifacts]
+    r'https://mvnrepository.com/artifact/org.opencord/\S+',
+])
+
+## -----------------------------------------------------------------------
+## https://jira.opencord.org/browse/VOL-5079
+## -----------------------------------------------------------------------
+linkcheck_ignore.extend([
+
+    # (voltha-openonu-adapter-go/docs/PM_Notes: line  287) broken    https://github.com/opencord/voltha-protos/blob/master/protos/voltha_protos/extensions.proto#L259 - Anchor 'L259' not found
+    r'https://github.com/opencord/voltha-protos/blob/master/protos/voltha_protos/extensions.proto#L259',
+
+    # (voltha-openonu-adapter-go/docs/PM_Notes: line  311) broken    https://github.com/opencord/voltha-protos/blob/master/protos/voltha_protos/extensions.proto#L157 - Anchor 'L157' not found
+    r'https://github.com/opencord/voltha-protos/blob/master/protos/voltha_protos/extensions.proto#L157',    
+
+    # (voltha-openonu-adapter-go/docs/ONU_Upgrade_Notes: line   69) broken    https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L106 - Anchor 'L106' not found
+    r'https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L106',
+
+    # (voltha-openonu-adapter-go/docs/PM_Notes: line   15) broken    https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L61 - Anchor 'L61' not found
+    r'https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L61',
+
+    # (voltha-openonu-adapter-go/docs/ONU_Upgrade_Notes: line   70) broken    https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L125 - Anchor 'L125' not found
+    r'https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L125',
+
+    # (voltha-openonu-adapter-go/docs/ONU_Upgrade_Notes: line   71) broken    https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L116 - Anchor 'L116' not found
+    r'https://github.com/opencord/voltha-protos/blob/v4.0.11/protos/voltha_protos/device.proto#L116',
+    ])
+
+# [SEE ALSO]
+# -----------------------------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-the-linkcheck-builder
+
+# [EOF]