Add testcase for failing network config

Signed-off-by: Bas Zoetekouw <bas.zoetekouw@surf.nl>

tests/nets_test_ip/docker-compose.yml

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+version: "3"
+networks:
+    shared-network:
+        driver: bridge
+        ipam:
+            config:
+              - subnet: "172.19.1.0/24"
+    internal-network:
+        driver: bridge
+        ipam:
+            config:
+              - subnet: "172.19.2.0/24"
+
+services:
+    web1:
+        image: busybox
+        hostname: web1
+        command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
+        working_dir: /var/www/html
+        networks:
+            shared-network:
+                ipv4_address: "172.19.1.10"
+            internal-network:
+                ipv4_address: "172.19.2.10"
+        volumes:
+            - ./test1.txt:/var/www/html/index.txt:ro,z
+    web2:
+        image: busybox
+        hostname: web2
+        command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
+        working_dir: /var/www/html
+        mac_address: "02:01:01:00:02:02"
+        networks:
+            internal-network:
+                ipv4_address: "172.19.2.11"
+        volumes:
+          - ./test2.txt:/var/www/html/index.txt:ro,z
+
+    web3:
+        image: busybox
+        hostname: web2
+        command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
+        working_dir: /var/www/html
+        networks:
+            internal-network:
+        volumes:
+          - ./test3.txt:/var/www/html/index.txt:ro,z
+
+    web4:
+        image: busybox
+        hostname: web2
+        command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
+        working_dir: /var/www/html
+        networks:
+            internal-network:
+            shared-network:
+                ipv4_address: "172.19.1.13"
+        volumes:
+          - ./test4.txt:/var/www/html/index.txt:ro,z

tests/nets_test_ip/test1.txt

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+test1

tests/nets_test_ip/test2.txt

@@ -0,0 +1 @@
+test2

tests/nets_test_ip/test3.txt

@@ -0,0 +1 @@
+test3

tests/nets_test_ip/test4.txt

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+test4