Proper deprecation for is_ans1_token
Proper deprecation for is_ans1_token

is_ans1_token wasn't properly deprecated since it used LOG.warn
rather than warnings/debtcollector. Proper deprecation requires use
of warnings and documentation.

bp deprecations

Change-Id: I81be2844014745a5951ce91a336e9e9ecf4d5328

klmitch/python-keystoneclient,Mercador/python-keystoneclient,magic0704/python-keystoneclient,magic0704/python-keystoneclient,klmitch/python-keystoneclient,Mercador/python-keystoneclient,sdpp/python-keystoneclient,sdpp/python-keystoneclient