test_cli: make timers more reliable
test_cli: make timers more reliable

A slow Travis-CI host caused one the 1.0s KEY_TIMER to fire by accident,
making the test fail because it wasn't expecting to see the "please be
patient" message. Fixed this by increasing the timeout to a very large value
when we aren't explicitly testing it.

warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole