control/controlclient, ipn/ipnlocal: remove Client.SetExpirySooner, fix race

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Client.SetExpirySooner isn't part of the state machine. Remove it from
the Client interface.

And fix a use of LocalBackend.cc without acquiring the lock that
guards that field.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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