move or replace boilerplate closure tests in irradiance decomposition functions

[mikofski]

Is your feature request related to a problem? Please describe.
The following code is repeated in erbs, disc, and other irradiance decomposition functions.

bad_values = (solar_zenith > max_zenith) | (ghi < 0) | (dni < 0)
dni = np.where(bad_values, 0, dni)

Describe the solution you'd like
Consolidate these lines to a private function. Use complete_irradiance() where appropriate. Document and confirm that these checks indeed remove inconsistent or "bad values"

Describe alternatives you've considered
do nothing

Additional context
Related to #1179 (review)