multi: fix rpcclient shutdown

[yyforyongyu]

Cherry-picked commits from the final blockbeat to reduce the PR size.

Depends on btcsuite/btcwallet#964

Make sure we call WaitForShutdown on the rpcclient and perform a fast exit in recordFlapCount.

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[guggero]

LGTM, barring dependent PRs.

[ellemouton]

lgtm - one suggestion :)