initial commit of split out ansible role. 

this has been living in the percona-ansible repo, but splitting it out now that we have proper smartos support ansible-role-bootstrap (thanks rafe) 

@rafecolton @jszwedko @meatballhat  
is there a way to use a var to conditionally include a task file directly, the way you can with include_vars?
guarding with 'when: ansible_os_family' looks goofy