Daniel Nephin b92084b8e8 ca: reduce consul provider backend interface a bit
This makes it easier to fake, which will allow me to use the ConsulProvider as
an 'external PKI' to test a customer setup where the actual root CA is not
the root we use for the Consul CA.

Replaces a call to the state store to fetch the clusterID with the
clusterID field already available on the built-in provider.
2021-11-25 11:46:06 -05:00
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