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Also extend fake_cryptohome_client to support multiple keys, checking keys, and
removing keys. The implementation is still not entirely correct, but good enough
for testing PIN.

Bug: 826773
Change-Id: I3f789c87095b663ca3ab6fb8becae5e924f02a5a
Reviewed-on: https://chromium-review.googlesource.com/1054247Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559228}