Fix '::acs::test::set_user' for cases when 'address' is not an IP, but a hostname. The address, if not provided by the TestURL parameter, is parsed from 'ns_conn location', and in both cases it can be hostname instead of an IP. The 'address' is later compared against 'ns_conn peeraddr' in security proc's 'sec_handler', which is always an IP, preventing login on those cases. To avoid this, we try to resolve the address in advance.
Rename 'Se', the selenium driver, to '::acs::test::selenium::Se', and repack it into an ad_proc, deprecating the former one and adding the comments on the file proc doc.