Add the new RewriteMap types `rnd' and `int' to mod_rewrite to allow Apache to

Add the new RewriteMap types `rnd' and `int' to mod_rewrite to allow Apache to
be used as a Reverse Proxy (where the backend servers are choosen via a `rnd'
map) and to allow mass virtual hosting without <VirtualHost> sections (where
you have to fix the case of server names when translating the Host-Header to a
directory structure).

Together with the comitted ProxyPassReverse directive we now have solved
two things the users have asked in the past:

1. The ability to use Apache as a full-featured Reverse Proxy
2. The ability to do mass virtual hosting without <VirtualHost> sections.

For both topics we should write stand-alone documents (perhaps inside
htdocs/manual/misc/) because they are not trivial to do, even when we now have
the functionality ;-)

Submitted by: Ralf S. Engelschall
Reviewed by: Dean Gaudet, Ralf S. Engelschall

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@80298 13f79535-47bb-0310-9956-ffa450edef68