Skip arbitrary Jinja markers in get_roles
    
    Instead of only skipping lines starting with '{%', skip all lines
    containining any Jinja markers ('{%', '{#', '{{') at any location
    in the line.
    This allows for reading all role SLS files in our repository.
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>