Add http_anchors, _revoke, and _hostname settings

Add http_anchors, http_revoke, http_hostname and
http_require_crl_checking settings, mimicking both the locations and
effects of their similarly-named PKINIT counterparts, but affecting
HTTPS connections to KDC proxy servers.

The hostname checking aims to match behavior described in RFC6125.
Check for strtoul() correctly
Add a simple KDC proxy test server

This proxy server uses python-paste to run the kdcproxy from
https://pypi.python.org/pypi/kdcproxy.  It should be used along
with the proxy.pem certificate in ../tests/dejagnu/proxy-certs.
Add a test for MS-KKDCP client support