I2cdevice ast issue

[osterwood]

Two tests had the same function name, so only the later one was run (comparing the micropython template). This patch:

• Fixes the test runner so that i2c-device outputs are compared
• Fixes a small whitespace issue in the template when BitFields are used
• Updated the test reference files per the off-by-one error (see https://github.com/google/cyanobyte/pull/222)

Also, the files generated by the i2c-device template are not valid python, if BitFields are used. The needs to be a comma between the BitField entries.

[Fleker]

Ah that was a small mistake, thanks for catching!