Change boolean values to be a percent between N and 100, so we can
support boolean choices that at a higher granularity.
Configure extensions (stream compression) for s_dumpcmp.
Turn off salvage for now, it doesn't yet support stream compression.
Consolidate wiredtiger open calls into one function to simplify things
(and always configure extensions).
--HG--
extra : rebase_source : 8394c3c22afa1ad6a515b7066ce8346605fd7b22