Remove blockdiag from Octavia

The python blockdiag module is unmaintained and will likely be removed from distros.[1]
This patch removes mention of blockdiag from Octavia as it is unused.

[1] blockdiag/blockdiag#171

Change-Id: I88371364b88bec5f1fd42d6ade8b316be3130f3f

doc/requirements.txt

@@ -6,7 +6,6 @@ hacking>=3.0 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
 sphinxcontrib-actdiag>=0.8.5 # BSD
 sphinxcontrib-apidoc>=0.2.1 # BSD
-sphinxcontrib-blockdiag>=1.5.4 # BSD
 sphinxcontrib-nwdiag>=0.9.5 # BSD
 sphinxcontrib-seqdiag>=0.8.4 # BSD
 docutils>=0.11 # OSI-Approved Open Source, Public Domain

doc/source/conf.py

@@ -57,7 +57,6 @@
     'sphinx.ext.autodoc',
     'sphinx.ext.todo',
     'sphinx.ext.viewcode',
-    'sphinxcontrib.blockdiag',
     'sphinxcontrib.actdiag',
     'sphinxcontrib.seqdiag',
     'sphinxcontrib.nwdiag',

specs-tests/test_titles.py

@@ -32,7 +32,6 @@ def fake_role(name, rawtext, text, lineno, inliner,
 
 
 directives.register_directive('seqdiag', FakeDirective)
-directives.register_directive('blockdiag', FakeDirective)
 directives.register_directive('nwdiag', FakeDirective)
 directives.register_directive('actdiag', FakeDirective)
 directives.register_directive('graphviz', FakeDirective)

specs/template.rst

@@ -35,7 +35,7 @@ Some notes about using this template:
 
 * If you would like to provide a diagram with your spec, text representations
   are preferred. http://asciiflow.com/ is a very nice tool to assist with
-  making ascii diagrams. blockdiag is another tool. These are described below.
+  making ascii diagrams. These are described below.
   For more complicated diagrams that need "real" graphics, yet still should
   be in the git revision control system, GraphViz .dot files are acceptable.
   If you require an image (screenshot) for your BP, attaching that to the BP
@@ -51,14 +51,6 @@ asciiflow::
   |          +-----+           +--------+          |
   +----------+     +-----------+        +----------+
 
-blockdiag
-
-.. blockdiag::
-
-  blockdiag sample {
-    a -> b -> c;
-  }
-
 actdiag
 
 .. actdiag::