kv: avoid immediately launching goroutine for txn heartbeat loop#35015

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ajwerner wants to merge 2 commits intocockroachdb:masterfrom ajwerner:ajwerner/stopper-delayed-async

+276-74

Commits on Feb 15, 2019

util/stop: add DelayedStopper to enable RunDelayedAsyncTask
ajwerner
committed

Commits on Feb 19, 2019

kv: delay starting heartbeat loop until after first interval
ajwerner
committed