Use parameter_defaults everywhere
Use parameter_defaults everywhere

This usage of parameters in utils.create_environment_file got missed as
part of the switch to parameter_defaults:
I2722e118abde1cea6210148b16ac1ed3d9f235d8

This was causing all the scale parameters to be set to 1, even if you
specified a higher number on the command line.

Change-Id: If7367c365c59ca0200dc7b643d8bbdfc7efa48fe

openstack/python-tripleoclient