cf logs - fix lint errors
cf logs - fix lint errors

[finishes #168654370](https://www.pivotaltracker.com/story/show/168654370)

Authored-by: Eric Promislow <6c389fa4d719bbeec88fea52ca3b2497804923ad@suse.com>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli