Add mod_proxy_ftp directives ProxyFtpListOnWildcard and ProxyFtpEscapeWildcards

to allow filenames with globbing characters to be retrieved instead of
presented in a directory listing.

Submitted by: Dan Poirier <poirier pobox.com>
Reviewed by: covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@758626 13f79535-47bb-0310-9956-ffa450edef68