Run most acceptance tests in-memory
This allows the tests to run faster, with lower system overheads.
The new @UseLocalDisk annotation must be added to any test method
that wants the classical init and daemon testing strategy.
A new sshd.requestLog configuration variable is introduced to
permit tests to disable the SSH command log.
Timing for `buck test --all` on my Linux desktop:
before 3m37.129s
after 2m18.789s
Change-Id: I18c07ef2d913f6abbb3925b3e7d3df5d28668497
(cherry picked from commit 318bfcae5cdf457893083e08aa550ab3d4335393)
19 files changed
