skip openssl client auth test

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index fdf91cb..e2289e7 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -11211,6 +11211,10 @@
             -s "tls13 server state: MBEDTLS_SSL_CLIENT_FINISHED" \
             -s "tls13 server state: MBEDTLS_SSL_HANDSHAKE_WRAPUP"
 
+# Skip this test before openssl exit code issue fixed
+# On fail, openssl return different exit code on OpenCI and internal CI for
+# this test.
+skip_next_test
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3
 requires_config_enabled MBEDTLS_DEBUG_C
 requires_config_enabled MBEDTLS_SSL_SRV_C