Consistent use of colors for warning and error msgs in spawner

[bijoua29]

For consistency, fix some error and warning log messages to use corresponding color

[aprotyas]

These LGTM but at this point I'm wondering whether it makes sense to introduce error/warn logging wrappers rather than include color strings in every invocation?

Something like:

def _colored_string(to_log, color):
    return color + to_log + bcolors.ENDC

def log_error(node, to_log):
    node.get_logger.error(_colored_string(to_log, bcolors.FAIL))

def log_warn(node, to_log):
    node.get_logger.warn(_colored_string(to_log, bcolors.WARNING))

[bijoua29]

These LGTM but at this point I'm wondering whether it makes sense to introduce error/warn logging wrappers rather than include color strings in every invocation?

Something like:

def _colored_string(to_log, color):
    return color + to_log + bcolors.ENDC

def log_error(node, to_log):
    node.get_logger.error(_colored_string(to_log, bcolors.FAIL))

def log_warn(node, to_log):
    node.get_logger.warn(_colored_string(to_log, bcolors.WARNING))

That's a good idea. Maybe do this in another PR?