Added fixed_network_name parameter

This parameter is required for tempest in case there are multiple networks while
testing.
Merge pull request #2 from hkumarmk/fixed_network_name

Added fixed_network_name parameter
Added code to provision cloud resources required for tempest

This patch add provision.pp to help provisioning the resources required for
tempest configuration.

This is a stripped down version of puppet-openstack/provision.pp