Revert fix that issues Unauthorized exception
Revert fix that issues Unauthorized exception

This reverts the fix to properly issue an Unauthorized
exception [1] because it was a workaround, and the proper fix
was made in oslo.incubator [2] and has been sync'd [3].

[1] I930fd61a896f62a2984cca1e4d40e5d89644aa3f
[2] I3b9a20174da482f570d02319e68f46dcaa10ca9c
[3] Iab799c8209872e2faa9ec6d33a426347b6478cce

Change-Id: Ia3f5695f73bfff19a9f24117fa881e8d9ed039d3
Closes-Bug: #1402840

NaohiroTamura/python-ironicclient,NaohiroTamura/python-ironicclient,openstack/python-ironicclient,openstack/python-ironicclient