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
Nuke get_policy().

Change-Id: I5031be0ae0acccd024e6db8b9a390597c87157e4
Rename --poll to --wait.

Change-Id: Ib7862293ce63e3f7c5bb402c17b8bf0e5a8940ef