Added cmdline information into fluentFormatter event message
Added cmdline information into fluentFormatter event message

Since process_name value defaults to "MainProcess" a new field cmdline
has been added in order to get information which process (daemon)
triggers the event.

Change-Id: I1d7713ff7de930e40fc5b8ceb2cf2af54082c9cc
Closes-Bug: 1822101

openstack/oslo.log