images: Update ubuntu-1604 image (cockpit-project#8252)

cockpituous · martinpitt · commit b4459b907004 · 2017-12-12T09:36:16.000+01:00
diff --git a/bots/images/ubuntu-1604 b/bots/images/ubuntu-1604
@@ -1 +1 @@
-ubuntu-1604-09f3e348179c6626d8cb5fdf3f3672c1cbb63be7e3f9a7a919d57369c0cb130e.qcow2
+ubuntu-1604-ec7832f9dfac8203364b770bd38e472e3a69f8b21f3496b553059e3751bcacb0.qcow2

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-ubuntu-1604-09f3e348179c6626d8cb5fdf3f3672c1cbb63be7e3f9a7a919d57369c0cb130e.qcow2`
	`1`	`+ubuntu-1604-ec7832f9dfac8203364b770bd38e472e3a69f8b21f3496b553059e3751bcacb0.qcow2`