Replacing deprecated 'auth_strategy' option from group 'DEFAULT'
with 'auth_strategy' option from group 'api'.
The configuration was moved to [api] group in Ocata:
b7b282ed08/nova/conf/api.py (L22)
Change-Id: Iffc6fe2f19746d866e1a3fe8ebed9645e45a7623
Closes-bug: #1837135