TT#24206 Use of legacy network device names

Checks:

- static configuration: passing the option "net.ifnames=0" to the
  kernel during boot

- check if there are such devices ("eth*") in the system when running

Change-Id: I7d17777463d4dee7c067d1bf3e08080f91898b45

templates/830_network-interfaces-legacy.yaml.tt2

@@ -0,0 +1,16 @@
+file:
+
+  /etc/default/grub:
+    exists: true
+    mode: "0644"
+    owner: root
+    group: root
+    filetype: file
+    contains: ['/^GRUB_CMDLINE_LINUX_DEFAULT=".*net.ifnames=0.*"/']
+
+command:
+
+  ip link:
+    exit-status: 0
+    stdout: ['/: eth[0-9]/']
+    stderr: []

templates/goss.yaml.tt2

@@ -37,6 +37,7 @@ gossfile:
 [% IF general.ngcp_type != 'spce' -%]
   822_network-ports-ngcp-pro.yaml: {}
 [% END -%]
+  830_network-interfaces-legacy.yaml: {}
   900_service-ngcp-api.yaml: {}
   910_service-influxdb.yaml: {}
   911_service-grafana.yaml: {}