Commits on Nov 21, 2016

1. A few backup process improvements. …

   - better backup error handling:
   When the backup fails, we now try to restore mysqld state anyway. That
   way the tablet becomes usable again.
   - Refactoring backup / restore code:
   So individual file backup / restore are each in their own function, instead of
   being two blocks deep.
   - Adding support for piping data through hooks.
   Also streamlining the hook creation, which changes the HookResult
   details a bit. All errors now are in Stderr.
   - Now supporting backup filters (optional, command-line driven).
   And adding one to backup test.
   - Add flag to disable backup compression (in case filter compresses).
   And add a test to make sure no backup is left-over upon
   backup failure.
   - Adding context to backupstorage API.
   The only current user is the GCS one, but it's way cleaner.

   

   alainjobart committed Nov 21, 2016
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