Add a new rudimentary test inspired by the examples from jmespath's
README file ([1]).
[1]: https://github.com/jmespath/jmespath.py/blob/develop/README.rst
Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
[Thomas: add entry in DEVELOPERS file]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
