Update dependency github.com/paultag/sniff

[antoineco]

The revision in Godeps.json doesn't exist (anymore?), so godep restore fails, which happened to me while importing this project as a dependency.

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[k8s-reviewable]

This change is 

[coveralls]

Coverage remained the same at 44.027% when pulling ba137f5 on antoineco:fix-godep-restore into 3495bfb on kubernetes:master.

[aledbf]

@antoineco we use a fork divergentdave/sniff@558797a because the upstream version had an error that seems to be resolved now.

[nicksardo]

@aledbf Are you saying we should redirect the dependency back to paultag?

[aledbf]

@nicksardo I need to test the fix

[aledbf]

/lgtm

[aledbf]

@antoineco thanks!