Attributes widget layour was changed from tiny table which allowed
to display only few options to a checkbox list with multiple
columns (depends on container).
Check all attributes option was removed to force the user
to read through the attributes which he selects.
Initial version authored by: Adam Misnyovszki
https://fedorahosted.org/freeipa/ticket/4253
Reviewed-By: Endi Sukma Dewata <edewata@redhat.com>
Tests modified to comply with PEP8 rules with exception of rule E501 (long lines).
Done by autopep8 tool and 2 manual modifications.
https://fedorahosted.org/freeipa/ticket/3744
