Make qemu integration tests more reliable

Set a static network configuration using cloud-init so that we don't
have to wait a long time for DHCP to work. Also, since we know the IP
and it is set earlier, this reduces the delay in testing on systems
without nested virt (like AWS).

Fixes #844.

Signed-off-by: Major Hayden <major@redhat.com>

test/cloud-init/network-config

@@ -0,0 +1,14 @@
+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