Clean up and Refactor the internal list storage structures to support
having multiple list heads/groups.  Define a separate list/group for
setup, normal test, and teardown.

The existing UtTest_Add() routine maps to the normal test group.
Added a UtTest_AddSetup() and UtTest_AddTeardown() routine that maps
to the setup and teardown group, respectively.

The existing UtTest_Run() routine then merges the groups and executes
the full suite of tests.

This allows separate, dynamic registration of test setup and teardown
routines which are executed before and after the normal test routine,
which can create and delete any global/common test prerequisites.

Fix #550, add function groups to ut assert

…OS_TimedRead and OS_TimedWrite missing functional tests (#549)