Check if a run workflow file points to an older version of manta and needs a refresh.

def _out_of_date(rw_file):
    """Check if a run workflow file points to an older version of manta and needs a refresh.
    """
    with open(rw_file) as in_handle:
        for line in in_handle:
            if line.startswith("sys.path.append"):
                file_version = line.split("/lib/python")[0].split("Cellar/manta/")[-1]
                if file_version != programs.get_version_manifest("manta"):
                    return True
    return False