Disable backup progress notifications for unit tests
Disable backup progress notifications for unit tests

We have code somewhere which is firing backup createprogress
notifications into the notifier, which causes random unit
test failures.

Until we determine exactly why this happening, attempt to
avoid this problem in the gate by disabling these notifications.

Related-Bug: #1412513

Change-Id: I50b7946562e757ee26cb68b17b4a5ffcd5f3fabd

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