Python: the rb9704 command line, a fake modem, and the tests

rb9704 drives a 9704 on USB and the Cloudloop account behind it, moved
from WII6's host/rockblock with its project names taken out. rb9704-fake
speaks JSPR on a pty or a serial port: everything the library asks, MO in
segments with the CRC checked, MT, signal, provisioning, refusals and
failures on command.

The tests run against the fake at every level: the fake itself, the
command line, Ground Control's Python binding, the shell sample on
native_sim, and the sample on a board (test_zephyr.py, one suite through
two consoles). test_real.py makes free checks against a real modem.

python/rb9704tools/__init__.py

@@ -0,0 +1,3 @@
+"""Host tools for the RockBLOCK 9704."""
+
+__version__ = "0.1.0"