Add staypuft-client-installer

Existing staypuft-installer now generates answer file for client
installer. Client installer prepares puppet on target machine and
registers itself in staypuft.
Sets up puppetssh

Generates SSH Key for foreman-proxy user and configures the
foreman-proxy service to use puppetssh

Override StrictHostKeySetting for foreman-proxy user
Spec update and version bump
Merge pull request #9 from ares/ssh_and_client_new

Ssh and client new