Static Thread methods and signal methods have been deprecated. Remove
all references in the main code, and most of the tests. Some tests of
the deprecated APIs themselves remain.
Made to prevent timeout if a single test case fails. The goal is that
each test case might wait only half of the remaining time reserved for
running TCP test cases.
From lowercase to uppercase and drops 'test_'-prefix. Test case
descriptions do also match to TC names now.
Additionally all the TCs are not behing MBED_EXTENDED_TESTS
anymore.