1) Add a base class for all of the instance objects.
2) Normalize usage of logging.
3) General cleanups of ipa-server-install.
4) Make better use of httpinstance.
5) Add webguiinstance.
6) Improve progress reporting during installation.
Works Here (TM), but it would be nice to get someone else
to test since this moves code around a bit.
Configure ipa servers as an ntp server and clients
to (by default) us the ipa server as an ntp server.
Also corrected the messages about which ports should
be opened.
