Change namespace package imports and update answers after updated sun position calculation

[jzuhone]

Description

This PR changes all "namespace" package imports to their new names. It also contains a follow-on to sot/ska_sun#36 which changed the default method of changing the sun position calculation, making it more accurate. This necessitated an update to the answers for the regression tests, which only had minor changes due to this update.

Interface impacts

None

Testing

Unit tests

• No unit tests
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Independent check of unit tests by [REVIEWER NAME]

• [PLATFORM]:

Functional tests

No functional testing.

[taldcroft]

LGTM. Namespace package updates are good. I spot-checked the "answers" diffs for one states file and see expected diffs: small changes in pitch and changes in maneuver attitude quaternions at the 12th decimal place. The latter is likely from using numba not numpy, but in any case is inconsequential.

[jeanconn]

The updates look good to me. I'd like to run the unit and regression tests but is there a recommended way to do so without installing the package? If I try to run pytest or python setup.py test from the repo I just get those E AttributeError: 'Namespace' object has no attribute 'test_root' errors.

[jzuhone]

@jeanconn from the top-level directory run py.test acis_thermal_check/tests/dpa for the 1DPAMZT tests

[Gregg140]

Namespace changes look good