minor: tweak test input sizes
Refactor: move initLogger into SchedIdempotentInternal, also
first test of the WaitNum option.  Doesn't work on AddRemoveSet test v2..
Nondeterministic even at DEBUG=1.
WIP: Shore up exn handling.  Temp hack to make putLV messages unique.
This enables non-deterministic randomized testing.  However, for
reproducable runs we will need pedigree to properly identify individual
puts.

Next step is to enable a randomized stress test that runs one test as many
times as possible in a single test process (and without excessive logging output).