Nathan Johnson bf805d1483 Add back ability to disable backup of snapshot to secondary (#3122)
* The snapshot.backup.rightafter configuration variable was removed by:

SHA: 6bb0ca2f854

This adds it back, though named snapshot.backup.to.secondary now instead.

This global parameter, once set, will allow you to prevent automatic backups of
     snapshots to secondary storage, unless they're actually needed.

Fixes #3096

* updates per review
2019-02-04 19:08:42 -02:00
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