tensorflow / k8s / 584

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add gometaliner into travis build  (#254)

and gradually tighten the linting rules. for now unused and golint are left out.

some fixes are included in this PR.

using gometaliner instead of just golint because:

it covers more cases, e.g. the typo checkings.
it also allows for disabling rules w.r.t regex, e.g. when you don't want to enforce all the comment rules enforced by golint

* Part of #53

23 of 23 new or added lines in 6 files covered. (100.0%)

572 of 1512 relevant lines covered (37.83%)

3.45 hits per line