Setup SSH Keys for the nova users on compute hosts

This is required for live migrations and resizes to work
* Creates the nova .ssh directory
* Sets up SSH private and public Keys
* Adds public key to authorized_keys file
* Sets StrictHostChecking=no for the nova user

Fixes #5
Fixes #6
fixes issue #8
Merge pull request #7 from andymcc/nova_key_fix

Setup SSH Keys for the nova users on compute hosts
Merge pull request #10 from cloudnull/Issue8

fixes issue #8
Merge branch 'master' of https://github.com/rcbops/ansible-lxc-rpc into cdc
updated for frozen python repos
added new files