Add a framework for integration testing
    
    Add methods to run commands and copy files to Host objects.
    Adds a base class for integration tests which can currently install
    and uninstall IPA in a "star" topology with per-test specified number
    of hosts.
    A simple test for user replication between two masters is provided.
    Log files from the remote hosts can be marked for collection, but the
    actual collection is left to a Nose plugin.
    
    Part of the work for: https://fedorahosted.org/freeipa/ticket/3621