Fixes a race condition causing test failures in async node test initialization routine. In the previous implementation the expected apcket could have arrived earlier than the expectation was created if the g_executor thread was faster than the main thread. This caused the expectation to never match later.
Fixes a race condition causing test failures in async node test initialization routine.
In the previous implementation the expected apcket could have arrived earlier than the expectation was created if the g_executor thread was faster than the main thread. This caused the expectation to never match later.

bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn