Remove center/radius and put the data centers in the testdata_jointcal
README instead.
Move instrumentClass and instrumentName into setUp_base.
Remove gen2 test args, class attrs, and test methods.
Add tests that the correct number of gen3 output products were written.

Cleanup cfht and cfht_minimal tests to use new base class features.

Remove some tests that were made redundant by converted gen3 CFHT tests
or other HSC tests that are now converted.

Cleanup some tests to use common setup methods to clarify metric values.

Update metrics of the 10_visits test, because gen3 runs the r/i data separately;
gen2 fit all filters together.