Update dependencies via glide update --strip-vendor

[G-Harmon]

I also had to clear my glide cache (~/.glide/cache) because I hit
Masterminds/glide#592 .

Do this to pick up Nikhil's change in ingress-gce to stop showing testing flags in kubemci -h
(kubernetes/ingress-gce#69)

Testing: Since this picks up a fair amount of new ingress-gce/ code (like NEGs
support), I ran demo.sh and saw that the ingress works.

---

This change is 

[k8s-ci-robot]

Hi @G-Harmon. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[G-Harmon]

cc @nikhiljindal @madhusudancs @csbell

[nikhiljindal]

/ok-to-test

[nikhiljindal]

Thx, lgtm. I am surprised this reduces our line count.

/lgtm