Refactor logging configuration

Move logging configuration to lymph.utils.logging and add a new function
setup_logger that can be used by specific drivers and lymph extentions
to setup logging for specific logger instead of having hardcoded logger
configuration in lymph.
``--loglevel`` already has a default: https://github.com/deliveryhero/lymph/blob/master/lymph/cli/base.py#L18