Fix functional test_signal_during_suspend

With some particular timing the stack returned by stack.get() is still
in SUSPEND_IN_PROGRESS and lacks `outputs` attribute.

Wait not only for nested stack to go to SUSPEND_COMPLETE, but for parent
stack too.

Change-Id: I8248146089f517c89f19321b796bfe750b14983b
Closes-Bug: #1440653
1 file changed
tree: 2dbe5eb24373f241324ff24ec34b74720514f079
  1. common/
  2. functional/
  3. scenario/