Make hostname_lookups a per-directory core configuration variable.

Replace all accesses to the connection.remote_host and remote_name
variables to calls to get_remote_host(), which is now in http_core.c
Also fix prototype of table_set() and in_domain().

Submitted by: drtr@ast.cam.ac.uk (David Robinson)
Obtained from: 111a.host.patch


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@76334 13f79535-47bb-0310-9956-ffa450edef68