Introduce the ForceLanguagePriority options;

  Prefer will circumvent a Multiple Choices by electing the first matching
  language from the LanaguagePriority list.

  Fallback will circumvent a None Acceptable by electing the first
  language found from the LanaguagePriority list.

  This breaks [expectedly] the negotiation tests.  They need review.
  My test results will be posted to dev.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92655 13f79535-47bb-0310-9956-ffa450edef68