Part of "consistency-file-rename" spec [1]
This commit also changes the following:
* Update corresponding references to common in various guides
* Rename excluded_patterns in conf.py of various guide
* Rename existing entries in www/static/.htaccess
* Add entries to .htaccess to redirect renamed files
[1] http://specs.openstack.org/openstack/docs-specs/specs/newton/consistency-file-rename.html
Change-Id: I39a9d5b95535cad1918ee64e95dee5ef18ab2cbe