test_data: Update Ubuntu cloud-init to support all integration tests

Updating the cloud-init files related to Ubuntu images is needed to be
able to use Ubuntu images for running all integration tests.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

test_data/cloud-init/ubuntu/network-config

@@ -1,12 +1,26 @@
-network:
-  version: 1
-  config:
-    - type: physical
-      name: eth0
-      mac_address: 12:34:56:78:90:ab
-      subnets:
-         - type: static
-           address: 192.168.2.2/24
-           gateway: 192.168.2.1
-           dns_nameservers:
-              - 192.168.2.1
+version: 2
+ethernets:
+  id0:
+    match:
+      macaddress: 12:34:56:78:90:ab
+    addresses:
+    - 192.168.2.2/24
+    gateway4: 192.168.2.1
+  id1:
+    match:
+      macaddress: de:ad:be:ef:12:34
+    addresses:
+    - 192.168.2.3/24
+    gateway4: 192.168.2.1
+  id2:
+    match:
+      macaddress: de:ad:be:ef:34:56
+    addresses:
+    - 192.168.2.4/24
+    gateway4: 192.168.2.1
+  id3:
+    match:
+      macaddress: de:ad:be:ef:56:78
+    addresses:
+    - 192.168.2.5/24
+    gateway4: 192.168.2.1