In order to make the license that applies to each file as clear as possible, and to be consistent with elasticsearch, we are adding Apache 2.0 license headers to the top of each file.
Existence of this header is enforced by eslint and tslint and missing headers were automatically added in the last commit by running:
```
node scripts/eslint --fix && node scripts/tslint --fix
```
ES snapshots are located again within the base elasticsearch directory and NOT within an additionally nested elasticsearch-oss directory
Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>
* [kbn-es/cluster] fix promise handling to properly route success/failure
* [kbn-es/cli] catch errors that bubble to the CLI and log with a bit of style
* [kbn-es] fix promise handling when building from source
* [kbn-es] check for inverse of .stop() condition
* [kbn-es/cluster] resolve promise is cluster stops cleanly
* [kbn-es/cluster/start] reject if ES exits before starting
When kbn-es downloads a snapshot, it writes the in progress download to
`/tmp` rather than the destination path in case the download fails part
way through, then renames the file from `/tmp` to the final location.
This is a good practice, but in CI the `/tmp` directory isn't stored on
the same disk as the project, which causes a rename error to occur
because we're attempting to rename across devices.
This updates the download logic to write to `${destPath}.tmp` instead,
and do the same renaming, so that we can avoid cross-device errors.
