[JENKINS-59777] Updated docker-commons to 1.15#193

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arthurvanduynhoven wants to merge 2 commits intojenkinsci:masterfrom

arthurvanduynhoven:patch-1

Commits on Oct 14, 2019

Updated docker-commons to 1.15 and other dependencies
arthurvanduynhoven
committed
remove check for null as it's being check in docker-commons library
arthurvanduynhoven
committed