New check routine check_cmd_context() -- controls whether a particular

directive is allowed in <Directory/Files/Location>, <Limit> or
<VirtualHost> context and complains if it isn't.
Reviewed by:	Dean Gaudet, Jim Jagielski, Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79561 13f79535-47bb-0310-9956-ffa450edef68