🩹 pd: fix auto-https default grpc address #3650
Merged
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while working on #3627, i found that a conditional hinges on the wrong option.
this changes pd to follow what the comments and documentation state as the
intent of this code: change the default grpc address based on whether we
have an auto-managed https domain.
a second commit refactors the control flow for the default address. the
parse
calls only refer to hardcoded values defined in the source. let's define our
defaults as constants, so that we do not have error-handling logic that only
refers to what ought to be known-good addresses.