Use dictionary literal for dictionary creation
Use dictionary literal for dictionary creation

Dictionary creation could be rewritten as a dictionary literal.
for example:

token_values = {}
token_values['user_id'] = access.get('user', {}).get('id')

could be rewritten as

token_values = {'user_id': access.get('user', {}).get('id')}

TrivialFix

Change-Id: I0c5677b527d440b8faded31bf4d9d62805391ae3

Mercador/python-keystoneclient,Mercador/python-keystoneclient,klmitch/python-keystoneclient,klmitch/python-keystoneclient