Fix inconsistency with auth_tok/auth_token

Switch to using auth_token instead of auth_ok

Fixes LP# 1152826

Change-Id: I56569c1fa8f29b0474440c40644729d436d41c7b
Stop using --stat for ChangeLog.

It takes 15 seconds to generate the ChangeLog for nova. Without --stat,
it takes 0.5 seconds. Removing this makes using tox in nova about the
same speed as using install_venv/with_venv.

Change-Id: I626d5e788bfaf1a80b91d845f21af54680f81c35
Merge "Fix inconsistency with auth_tok/auth_token"