This patch:
- renames all the RST files in the ops-guide folder to use a
hyphen instead of underscore;
- adds redirects to the renamed files to .htacces;
- removes /([a-z-]+) from Admin Guide redirects in .htacces.
Change-Id: I4c35a4c89ae9900a2e9bfe1a7a3bcb94ab72454b
Implements: blueprint consistency-file-rename