Enable dependency pruning

[ironcladlou]

Enable pruning to downsize the vendor directory.

[Miciah]

dep check reports a couple problems:

% dep check
# vendor is out of sync:
github.com/gogo/protobuf: hash of vendored tree not equal to digest in Gopkg.lock
github.com/googleapis/gnostic: hash of vendored tree not equal to digest in Gopkg.lock

[ironcladlou]

1. We shouldn't gate on manual tests anymore; let's incorporate dep check into CI separately to rule out "works for me" issues
2. If dep check fails for you in your environment (which it does not for me), and all our existing tests pass, what exactly is dep check protecting us against?

[Miciah]

We shouldn't gate on manual tests anymore; let's incorporate dep check into CI separately to rule out "works for me" issues

The only other operator I found that gates on dep check is prometheus-operator (actually, it does a dep ensure and then a diff):

https://github.com/openshift/prometheus-operator/blob/master/scripts/golang-dep-ensure.sh
https://github.com/openshift/prometheus-operator/blob/master/.travis.yml#L18-L19

If dep check fails for you in your environment (which it does not for me), and all our existing tests pass, what exactly is dep check protecting us against?

Presumably it will prevent a PR that discomfits dep from necessitating additional effort from the next person who needs to deal with dep.

[Miciah]

I'll add gating on dep later.

/lgtm

[openshift-ci-robot]

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