Adding test for receive_buffer

[hkaiser]

This fixes #1733: Add unit test for hpx/lcos/local/receive_buffer.hpp

[sithhell]

This leads to the following error:

In file included from /hpx/tests/regressions/lcos/receive_buffer_1733.cpp:8:
/hpx/hpx/util/lightweight_test.hpp:106:17: error: comparison of integers of different signs: 'const unsigned long' and 'const int' [-Werror,-Wsign-compare]
        if (!(t == u))
              ~ ^  ~
/hpx/tests/regressions/lcos/receive_buffer_1733.cpp:124:5: note: in instantiation of function template specialization 'hpx::util::detail::fixture::check_equal<unsigned long, int>' requested here
    HPX_TEST_EQ(receive(MAX_ITERATIONS).get(), MAX_ITERATIONS);

[sithhell]

LGTM