Added sample files for Networking

Added neutron.conf, api-paste.ini, policy.json, rootwrap.conf,
and plug-in agent configuration sample files (referenced files
in neutron project). Placed under new section.

Change-Id: Iddba3b20c720dfdcbd37ce14ab9d1c70a9045dcf
Closes-Bug: #1281348
Merge "Added sample files for Networking"