New test suite: net

A place to put tests for the net_sockets module (MBEDTLS_NET_C feature).

Start with a context smoke test.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e2bc420..fb60427 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -134,6 +134,7 @@
 add_test_suite(mdx)
 add_test_suite(memory_buffer_alloc)
 add_test_suite(mpi)
+add_test_suite(net)
 add_test_suite(nist_kw)
 add_test_suite(oid)
 add_test_suite(pem)