tests: net: socket: tls_configurations: Limit to one toolchain

Limit these tests to be built and run with just one toolchain.
a) more importantly, each sub-test assumes there is no duplicate of itself
   running at the same time, as the subtest hardcodes the port being used,
   and another running in parallel will result in a port collision, and the
   test failing to start the OpenSLL server.
b) there seems to be little practical benefit of re-running all these tests
   variations with 2 toolchains.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

Author: aescolar

tests/net/socket/tls_configurations/tests.yaml

@@ -6,6 +6,9 @@ common:
     - native_sim
   integration_platforms:
     - native_sim
+  integration_toolchains:
+    # Only build/run with gcc so we don't try to run in parallel (in the same port) with clang
+    - host/gnu
   harness: pytest
 tests:
   net.sockets.tls12.psk_kex: