Second part of the new "Bugfix checklist" panel in the modules doc pages.

Second part of the new "Bugfix checklist" panel in the modules doc pages.
Changes discussed in docs@ and implemented:
- Moved Httpd to HTTPD
- Created a new link to quickly open a bug in Bugzilla
- Modified the link called "Open bugs" to "Known issues" and appended
  the bugzilla component name to the URL. In this way the user will only
  see bugs related to the module under review, not all the httpd ones.
  A little hack was necessary since some mpms have inconsistent naming
  (e.g. mpm_event in Bugzilla and event in docs).

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1740735 13f79535-47bb-0310-9956-ffa450edef68