Updating a CIDict with data like {'A': 1, 'a': 2} would lead to data
loss since only one of the items would get to the CIDict.
This can result in non-obvious bugs similar to this one in python-ldap:
https://bugzilla.redhat.com/show_bug.cgi?id=1007820
Raise an error in this case; any resolution must be done by the caller.
Make the CIDict interface match standard dict (except view* methods).
Add __contains__, __iter__, clear.
Add keyword and iterable support for __init__, update.
Also add values() and itervalues(). Previously the dict versions were
used; the new ones guarantee that the order matches keys().
Mark view* methods as not implemented.
CIDict.copy() now returns a CIDict.
Test the above additions, and fromkeys() which worked but wasn't tested.
Nose doesn't pick up directories that don't begin with 'test'.
Rename ipatests/test_ipaserver/install to test_install so that it's run.
Also, merge test_ipautil.py from ipapython/test into tests/test_ipapython,
so the whole test suite is in one place.
