samples/net: Add network-related functions to NATS Subscriber

- Add TCP/IPv4 routines to this sample.
- Add a testcase.ini file.

This NATS sample code demonstrates how to implement a NATS subscriber
application.

Change-Id: I25a7465b7163a09a0163859076a97b1e258a06f1
Signed-off-by: Flavio Santes <flavio.santes@intel.com>

samples/net/nats_clients/subscriber/src/Makefile

@@ -14,8 +14,13 @@
 # limitations under the License.
 #
 
+ccflags-y += -I${ZEPHYR_BASE}/net/ip/contiki
+ccflags-y += -I${ZEPHYR_BASE}/net/ip/contiki/os/lib
+ccflags-y += -I${ZEPHYR_BASE}/net/ip/contiki/os
+ccflags-y += -I${ZEPHYR_BASE}/net/ip
 ccflags-y += -I$(SOURCE_DIR)/../publisher/src
 
-obj-y += main.o
 obj-y += ../../publisher/src/nats_pack.o
 obj-y += ../../publisher/src/nats_client.o
+obj-y += ../../publisher/src/netz.o
+obj-y += main.o

samples/net/nats_clients/subscriber/src/main.c

@@ -18,8 +18,7 @@
 #include <stdio.h>
 #include <errno.h>
 
-/* Network for Zephyr API - netz					*/
-#include <netz.h>
+#include "netz.h"
 
 #include "nats_client.h"
 

samples/net/nats_clients/subscriber/testcase.ini

@@ -0,0 +1,5 @@
+[test]
+tags = net
+build_only = true
+arch_whitelist = x86
+platform_whitelist = galileo