TestFacility: do not wait until device backends are open
This was a left-over from times when no proper initial value propagation and exception handling was implemented in ApplicationCore. Waiting until the backends are open is anyway not sufficient, since the DeviceModule needs to finish the recovery procedure. If any test would still rely on this (anti-)feature, it would be subject to race conditions. The wait is removed because it prevents important tests for the exception handling specification. In particular, tests which intentionally break devices during startup of the application would not be implementable.
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