Several tasks in the auth.yml file were actually more closely related
to accounts rather than authentication. This patch moves tasks from
the auth.yml into accounts.yml and adjusts the docs to match.
This should alleviate confusion and allow deployers to fine-tune
their Ansible playbook runs.
Change-Id: I962014ba9022dd256dc04da6b4ac0860797fbc24
6e761efc9c