Currently ipaclient role is using the module ipaclient only for uninstallation,
and this module contains a lot of unused code.
It is simpler to directly call the command-line
ipa-client-install --uninstall -U
and remove the ipaclient module.
With the test it is not needed to pin down the python interpreter for ansible
modules. It is therefore possible to use a Python2 version on Fedora-27 and
a Python3 version on Fedora-26.
The rename was needed to be able to have more than one package in the list
of required packages.
For RHEL-7.3 it has been needed to add ipa-admintools to have /usr/bin/ipa
available. libselinux-python has been added for all.
