Missing socket greentea tests implementation

[michalpasztamobica]

Description

The TCP/UDP socket tests status is now fully in line with the test plan, with the exception of missing getsockopt implementation in LWIP stack.

Pull request type

[ ] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Docs update
[x] Test update
[ ] Breaking change

[michalpasztamobica]

@SeppoTakalo , @VeijoPesonen , @KariHaapalehto , please review.

[SeppoTakalo]

Check the Astyle errors.

[SeppoTakalo]

Also.. Do we want this to be copy&pasted on every single test case:

#if MBED_CONF_NSAPI_SOCKET_STATS_ENABLE
    int count = fetch_stats();
    for (int j = 0; j < count; j++) {
        TEST_ASSERT_EQUAL(SOCK_CLOSED,  tcp_stats[j].state);
    }
#endif

I'm fine for it now, but feel like we should refactor socket stats to its own test, so there would be less boilerplate to copy&paste on every single test case.

[michalpasztamobica]

Astyle fixed, I created an internal task ONME-4070, to make sure we refactor the socket stats.

[ciarmcom]

@michalpasztamobica, thank you for your changes.
@ARMmbed/mbed-os-test @ARMmbed/mbed-os-ipcore @ARMmbed/mbed-os-maintainers please review.

[cmonr]

Looks straightforward.

[cmonr]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 9 of 9 test jobs passed
Build number : 1
Build artifacts