Add HRC states: 15v on, HRC-I on, HRC-S on

[taldcroft]

Description

In support of HRC operations and load review checking (in particular acisops/acis_thermal_check#54), this adds three new HRC commanded state variables: hrc_15v, hrc_i and hrc_s. All three have state values of OFF or ON.

I regenerated the list of available commanded states in the documentation and found a few previously-added states that were not reflected in the docs.

A bug in the testing code was also discovered and fixed, namely that the fixture for temporarily setting the effective processing stop date was not clearing the commands cache at the end. This meant that subsequent tests were running with a truncated commands archive.

Finally, this PR cleans up a bunch of flake8 warnings related to line length.

Interface impacts

None.

Testing

Unit tests

• Mac

Functional tests

• Used in integration testing with Tool for HRC CEA  acisops/acis_thermal_check#54.

[jzuhone]

@taldcroft I can't click the checkbox above, but I tested this with acis_thermal_check and it works.