sdong d7a486668c Improve scalability of DB::GetSnapshot()
Summary: Now DB::GetSnapshot() doesn't scale to more column families, as it needs to go through all the column families to find whether snapshot is supported. This patch optimizes it.

Test Plan:
Add unit tests to cover negative cases.
make all check

Reviewers: yhchiang, rven, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D30093
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