Allow SetHandler+UDS+fcgi to take advantage of dedicated workers including

opting in to connection reuse and other proxy options (max=, etc).

adds 'enablereuse' proxyoption and a minor MMN bump to share
proxy_desocketfy outside of mod_proxy.c, which is required to
match workers to URLs.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1647009 13f79535-47bb-0310-9956-ffa450edef68