Backport of fix test flake for RPC TLS enforcement test into release/1.4.x #16203
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Backport
This PR is auto-generated from #16199 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
The RPC TLS enforcement test was frequently failing with broken connections. The
most likely cause was that the tests started to run before the server had
started its RPC server. Wait until it self-elects to ensure that the RPC server
is up. This seems to have corrected the error; I ran this 3 times without a
failure (even accounting for
gotestsum
retries).Also, fix a minor test bug that didn't impact the test but showed an incorrect
usage for
Status.Ping.