Policy distribution through nova.

The client-side portion of the policy distribution command. Simply
adds the install_policies command which reads the contents of the
local definitions file and sends it to the api server for
distribution.

Change-Id: I19a75de771646f700f84a030d0039330a2699465
WIP

Change-Id: I42af1bea9348d630820a86fc0df71f1d57b3b975