Allowing the stack to clear ensures that (in practice) DelayedStagingBucket
is given a chance to do necessary processing before data are requested from
it by bucket hooks as a result of _this_ invocation, which in turn
results (in some cases) in infinite recursion.
* src/client/dapi/DataApiMediator.js (_updateFieldData): Allow stack to
clear before invoking `quote.setData'.
* test/client/dapi/DataApiMediatorTest.js: Test respectively.
DEV-3257