These parameters are available in nova.conf, but were not
configurable using puppet-nova. The monkey patching parameters
allow patching a decorator for all functions in specified modules.
This change create patch/config.pp file to make these parameters
configurable.
Change-Id: I51ef3e19daff1d98cfe5c2c16475c16e6a3e3e0f
Closes-Bug: #1710292