scripts: net: Add TLS test for mqtt_publisher

In addition to the existing plain TCP MQTT test, add the same test
with TLS applied. Robert Lubos provided the updated test_cert.h, which
contains the same certificate as in the echo samples.

Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>

scripts/net/run-sample-tests.sh

@@ -318,7 +318,8 @@ docker_exec ()
 	mqtt_publisher)
 	    start_configuration || return $?
 	    start_docker "/usr/local/sbin/mosquitto -v -p 1883
-			  -c /usr/local/etc/mosquitto.conf" || return $?
+			  -c /usr/local/etc/mosquitto/mosquitto.conf" || \
+			      return $?
 
 	    start_zephyr -DOVERLAY_CONFIG=overlay-sample.conf "$overlay"
 
@@ -326,6 +327,24 @@ docker_exec ()
 	    result=$?
 
 	    stop_docker
+
+	    if [ $result -ne 0 ]
+	    then
+		break
+	    fi
+
+	    # test TLS
+	    start_configuration || return $?
+	    start_docker "/usr/local/sbin/mosquitto -v -p 8883
+			  -c /usr/local/etc/mosquitto/mosquitto-tls.conf" || \
+			      return $?
+
+	    start_zephyr \
+		-DOVERLAY_CONFIG="overlay-tls.conf overlay-sample.conf" \
+		 "$overlay"
+
+	    wait_zephyr
+	    result=$?
 	    ;;
 
 	*)