Remove cloud-init/network-config file from tests

- not used in oscap.sh test at all
- causes VM in libvirt.sh test to acquire a different IP address instead
  of the hard-coded one inside the test, which causes SSH to fail

- not used anywhere else

test/data/cloud-init/network-config

@@ -1,14 +0,0 @@
-network:
-  version: 2
-  renderer: NetworkManager
-  ethernets:
-    eth0:
-      dhcpv4: false
-      dhcpv6: false
-      addresses:
-        - 192.168.122.50/24
-      gateway4: 192.168.122.1
-      nameservers:
-        addresses:
-          - 1.1.1.1
-          - 8.8.8.8