Description of problem:
When a permission is edited, and Type switched, the attributes selected for
previous Type are still selected, and update fails, if they are invalid for the
new Type. But it should get deselected or not even listed if Type changes.

Version-Release number of selected component (if applicable):
ipa-server-2.2.0-8.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Add a permission as Type - User Group, and choose "description" as an
attribute.
2. Edit this permission, and change Type to be - Service.
3. Scroll to bottom of attributes, and description is listed and checked. But
description is not a valid attribute for Service.
4. Click Update


Actual results:
when 'Update' is clicked - throws error -
attribute(s) "description" not allowed.

Expected results:
When Type is changed, attribute list should be refreshed and if still
applicable should be chosen. And if Type is reverted back, previously chosen
attributes should be back as chosen.


Additional info:
this came up while working on related bug 807755