A few assorted API/version issues

[rebeccabilbro]

Describe the bug

@pdeziel I received a report about a few issues a user is experiencing:

I am getting the following error:

"pyensign.exceptions.EnsignRPCError: received gRPC error from Ensign: UNAVAILABLE: Getting metadata from plugin failed with error: cannot unpack non-iterable SSLCertVerificationError object ((14, 'unavailable'))"

I think it is related to the updated Ensign library that we discussed the other day, but I am using the version provided in the rotational's github repositories.

Additionally, I am getting an error in my Pycharm when importing

from pyensign.api.v1beta1.ensign_pb2 import Nack

Cannot find reference 'Nack' in 'ensign_pb2.py'

details can be found here:
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Issue
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