[networking] Add unused common/* to exclude_patterns

In the networking guide, only app_support, conventions and
glossary are referred to and all other files are unused.
To avoid unnecessary warnings during build, unused common files
should be added to excluded_patterns in conf.py.

Change-Id: Ide56ad3f39fd152576e3681101822f5644a5cbbd

doc/networking-guide/source/conf.py

@@ -90,6 +90,9 @@ html_context = {"gitsha": gitsha, "bug_tag": bug_tag,
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 exclude_patterns = ['common/cli*', 'common/nova*',
+                    'common/get_started_*',
+                    'common/support-compute.rst',
+                    'common/dashboard_customizing.rst',
                     'common/log_in_dashboard.rst']
 
 # The reST default role (used for this markup: `text`) to use for all