Commits on Sep 12, 2016

1. Making datastore batch/transaction more robust to failure. …

   - Ensuring that `Batch` methods `put()`, `delete()`,
     `commit()` and `rollback()` are only called when the batch
     is in progress.
   - In `Batch.__enter__()` make sure the batch is only put on the stack
     after `begin()` succeeds.
   - `Client.delete_multi()` and `Client.put_multi()` (and downstream methods)
     now call `begin()` on new `Batch` (since required to be in progress).
   - `Transaction.begin()` if `begin_transaction()` API call fails, make
     sure to change the status to `ABORTED` before raising the exception
     from the failure.
   
   Fixes googleapis#2297.

   

   dhermes committed Sep 12, 2016
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