Improve debugging of network wiring flake
Improve debugging of network wiring flake

Check early that gdn has exited and then print network interface info
which should be closer to that causing the failure

[#172128896]

Co-authored-by: Yulia Nedyalkova <7434cf6db6c17ad5b6ef614abe065a9cda1d30c1@hotmail.com>

cloudfoundry-incubator/guardian,cloudfoundry-incubator/guardian,cloudfoundry-incubator/guardian