improve mod_perl config functions to allow reaching all any depth of the config hash

[fprintf]

Currently you can only access one level deep into the hash, this means there is no reasonable way to setup multiple servers outside of doing someting stupidl ike server_one, server_two_host, server_two_pass, etc..

This is easily fixable by making the existing mod_conf_foreach function recursive and a little smarter about how it does callbacks, alternatively we could do this with a state machine