+ minimal tests to ensure execution.

Matias Guijarro authored Mar 10, 2020 and Cyril Guilloud committed Mar 10, 2020

+ fix pylint warnings

General context manager to rock a motor.

- added `lprint` function on shell/standard to sent messages to stdout
  and to logbook (not yet implemented)

- created module to contain shell printing functions
- splitted frontend to backend part from bliss/common/standard