After moving to oslo.config we still were using
incubator config generator. This was ok, but the
problem is we haven't been pulling config options
from the oslo libs.
This is a hack that just appends external lib calls
and appends those options to the sample file being built.
Change-Id: I2634b20ef4abd3bf7990f845d59ad3d208db234f
Closes-Bug: #1447380