Merge r427920 from trunk:

Enable ProxySet inside <Proxy> section to
create balancer or worker if they were not
already created.
This allows to have ProxySet directive before
BalancerMember directives inside Proxy section.
Submitted by: mturk
Reviewed by: root


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@571622 13f79535-47bb-0310-9956-ffa450edef68