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Add a Sync integration test which exercises custom passphrase flows in
an end-to-end manner with two clients. The test ensures that two clients
can sync data properly in the presence of custom passphrase-based
encryption and different key derivation methods.

Refactor SetScryptFeatureState() from the single-client test to a scoped
feature toggler that resides in encryption_helper, because the
functionality now needs to also be used from the two-client test.

Bug: 894148
Change-Id: Ia211b221f89a99092d3b19690ecae6bb4fa77d02
Reviewed-on: https://chromium-review.googlesource.com/c/1277648
Commit-Queue: David Davidović <davidovic@google.com>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599929}