Passing any CLI arguments to log-api is not possible
for the case where it runs under gunicorn server.
Gunicorn's argument parsing processes clashes with oslo's.
Effectivelly that means that either of them cannot understand
the arguments of another. However log-api is capable of being launched
under, for example, apache_mod-wsgi.
That permits passing oslo CLI arguments.
Added simple method that detect the executable that was used to run
log-api. If that is not gunicorn, CLI opts will be enabled.
Otherwise log-api will print out warning and proceed as it was.
Extra:
* reworked to use fixtures
Change-Id: I6b2fc386aeb823ab735270ffc1d3f7e15985830f
138ac174c4