Description of problem:
In file rpcserver.py on line 298 the check

<code>
if not environ['HTTP_REFERER'].startswith('https://%s/ipa' % self.api.e\
nv.host) and not self.env.in_tree:
</code>

does not allow for moving the freeipa UI away from port 443. If the freeipa UI
is moved away from 443 this check produces the "RefererError" when in fact the
referer is fine - the test is just wrong.

Version-Release number of selected component (if applicable):
2.2.0

How reproducible:
Easily.

Steps to reproduce:
1. Install ipa-server
2. Configure the freeipa UI (configure Apache) to run on some port other than
80/443.
3. Try to login.

Actual results:
Referer Error is produced at login.

Expected results:
Successful login

Fix:
Reduce check to "https://%s" or modify check to use a regex that allows for
port numbers by adding "(:\d+)?".