How to test UCT/self component?

[Honggang-LI]

#7549

I know the src/test/gtests covers the self component. Unfortunately, the test cases are buried in those too many cases.

It is not easy to narrow down tests covers the self component. And it is also not funny to trace such buried tests with gdb.

thanks

[yosefe]

UCT_INSTANTIATE_TEST_CASE() and UCP_INSTANTIATE_TEST_CASE() macros create instances of every test case for self transport