Daniel Lohse 00ef4e3281 Allow Raft storage to be configured via env variables (#7745)
* Fix unordered imports

* Allow Raft node ID to be set via the environment variable `VAULT_RAFT_NODE_ID`

* Allow Raft path to be set via the environment variable `VAULT_RAFT_PATH`

* Prioritize the environment when fetching the Raft configuration values

Values in environment variables should override the config as per the
documentation as well as common sense.
2019-10-28 09:43:12 -07:00
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