The new default configuration file name has changed to
monasca-persister.conf. This change updates documentation to use the new
default.
Change-Id: Ic271221f19cdc86e8297ed88cdcf4a86df4374b8
Story: 2004867
Task: 29534
To generate the sample config file, do what other OpenStack projects do
and use the oslo.config provided mechanism.
Story: 2001009
Task: 4201
Change-Id: I490de4110843f7dfd618a6a8cc8d6a4e35db65ce