This moves code that does HTTP and HTTPS requests into a common library
that can be used by both the installer and the dogtag plugin.
These functions are not generic HTTP/S clients, they are designed
specifically to talk to dogtag, so use accordingly.
This involves creating a new CA instance on the replica and using pkisilent
to create a clone of the master CA.
Also generally fixes IPA to work with the latest dogtag SVN tip. A lot of
changes to ports and configuration have been done recently.
