Instantiating with platform/name and inst_module

[rstoneback]

Describe the bug
A user can create an instantiation call with a supplied platform/name, as well as an inconsistent module for inst_module, and the pysat Instrument object will create itself despite the inconsistent inputs.

To Reproduce
Steps to reproduce the behavior:

In [8]: inst = pysat.Instrument('cnofs', 'ivm', inst_module=pysatNASA.instruments.cnofs_vefi, tag='dc_b')                                                                                                                   

In [9]: inst.name                                                                                                                                                                                                           
Out[9]: 'vefi'

Expected behavior
A warning or error given the inconsistency.

Screenshots
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Desktop (please complete the following information):

• OS: MacOS
• Version Python 3.8
• Other details about your setup that could be relevant

Additional context
Add any other context about the problem here.

[rstoneback]

Don't forget to add a unit test for every bug discovered.

[jklenzing]

Requires merge of #903 before new tests can be added

[jklenzing]

I think a warning would be appropriate here.

[jklenzing]

Closing with merge of #917