Add general authn and authz modules to hold non-authxxx specific directives...

Add general authn and authz modules to hold non-authxxx specific directives such as authtype, authname and require.  Remove authtype and authname from mod_core.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/authz-dev@354331 13f79535-47bb-0310-9956-ffa450edef68