release-2.1: server: deflake TestRapidRestarts #29259
Merged
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Backport 1/1 commits from #29230.
/cc @cockroachdb/release
In go1.10 and earlier, it was not safe to call
http.ServeMux.ServeHTTP
concurrently with
http.ServeMux.Handle
. (This is fixed in go1.11). Inthe interim, provide our own safeServeMux wrapper that provides proper
locking.
Fixes #29227
Release note: None