Eliminate variables where unneeded; move ";type=" checking code to front;

drop redundant log messages (covered by proxy_ftp_command());
do checks for /%2f as in apache-1.3.24;
escape path argument in SIZE command


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93120 13f79535-47bb-0310-9956-ffa450edef68