cockroachdb/cockroach

mberhault libroach: encrypt data at rest.

Part of encryption-at-rest (see #19783)

Quick overview:
* file registry records encryption settings for encrypted files
* an encrypted env has a "env level" (plain, store, data) and a key
manager as a source
* the data key manager uses an encrypted env with the store key manager as
key source
* rocksdb uses an encrypted env with the data key manager as key source

Release note: none

Latest commit b641eac

Jan 13, 2018

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APL.txt	*: clarify licensing	Nov 10, 2017
BSD-biogo.txt	*: clarify licensing	Nov 10, 2017
BSD-golang.txt	*: clarify licensing	Nov 10, 2017
BSD-grpc.txt	licenses,storage: extract GRPC license into dedicated file	Nov 17, 2017
BSD-vitess.txt	*: clarify licensing	Nov 10, 2017
CCL.txt	*: clarify licensing	Nov 10, 2017
LevelDB.AUTHORS	libroach: encrypt data at rest.	May 2, 2018
LevelDB.txt	libroach: encrypt data at rest.	May 2, 2018
MIT-jsontestsuite.txt	licenses,util/json: extract JSON test suite license into dedicated file	Nov 17, 2017
PostgreSQL.txt	licenses: add PostgreSQL license	Nov 17, 2017