To account for potential of imprecise timing/clock sampling when running
on a VM, allow for a wider range of time values to pass the test.

Ensures that OS_GetTaskId_Impl() returns OS_OBJECT_ID_UNDEFINED
if called from the root task - as this does not have an OSAL task ID.

The number of asserts being printed was still taking longer than 1000ms
on a 9600 baud serial link, so increasing the timeout allows tests to
pass.

In the osal_core_UT test, the test task was being deleted while it was
in the midst of a UtPrintf call, which left the BSP mutex in a locked
state, causing deadlock.

Using SEM_DELETE_SAFE attribute avoids task deletion for the mutex
holder, and adding a small delay to the test case makes all the
messages appear as expected (accounts for slow serial console on
test platform).

For the MCP750, the symbol table fairly large and requires a considerably
larger limit to avoid the OS_ERR_OUTPUT_TOO_LARGE limit.  This also uses
a different name, so that the user can actually see the symbol dump file
if they want (otherwise the next test overwrites the file).

Skip the registration of a timer in VxWorks when the assigned_signal
is 0 (this indicates an external sync function is used).

Fix #1080, add range to OS_TaskDelay checks

Fix #1084, root task ID on RTEMS

Fix #1082, increase UT symbol dump size limit

Fix #1087, do not register RTOS timer for external sync

Fix #1088, avoid task delete during UtPrintf

Fix #1096, Add OSAL prefix to Network API group

Fix #1086, increase timeout in network-api-test