Add check of sem_wait/rtems_semaphore_obtain in console loop

[skliper]

Is your feature request related to a problem? Please describe.
Console loop could spin if the semaphore returns error.

Describe the solution you'd like
Check for real errors (not just interrupted), and exit loop if needed.

Describe alternatives you've considered
None.

Additional context
Mentioned in #667

Requester Info
Jacob Hageman - NASA/GSFC

[skliper]

Issue only applies to POSIX and RTEMS:

osal/src/os/posix/src/os-impl-console.c

Lines 102 to 107 in d698a4d

	/* Loop forever (unless shutdown is set) */
	while (OS_SharedGlobalVars.ShutdownFlag != OS_SHUTDOWN_MAGIC_NUMBER)
	{
	OS_ConsoleOutput_Impl(&token);
	sem_wait(&local->data_sem);
	}

osal/src/os/rtems/src/os-impl-console.c

Lines 126 to 130 in d698a4d

	while (OS_SharedGlobalVars.ShutdownFlag != OS_SHUTDOWN_MAGIC_NUMBER)
	{
	OS_ConsoleOutput_Impl(&token);
	rtems_semaphore_obtain(local->data_sem, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
	}

Already implemented in VxWorks:

osal/src/os/vxworks/src/os-impl-console.c

Lines 110 to 118 in d698a4d

	while (OS_SharedGlobalVars.ShutdownFlag != OS_SHUTDOWN_MAGIC_NUMBER)
	{
	OS_ConsoleOutput_Impl(&token);
	if (semTake(local->datasem, WAIT_FOREVER) == ERROR)
	{
	OS_DEBUG("semTake() - vxWorks errno %d\n", errno);
	break;
	}
	}