vmware_guest_network/test: disable the test

The test fails in the CI with a timeout of vmware_guest_tools_wait. It's
still unclear if this comes from:

- the ESXi environment
- the VM configuration, e.g: the amount of the RAM
- the ISO image itself

Ideally, we should have a light VM with the vmware-tools.

test/integration/targets/vmware_guest_network/aliases

@@ -2,3 +2,5 @@ cloud/vcenter
 shippable/vcenter/group1
 needs/target/prepare_vmware_tests
 zuul/vmware/vcenter_1esxi
+# until we figure out why vmware_guest_tools_wait fails in the CI
+disabled