Jenkins: fix Docker image build on Linux for master branch #317
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Description of the Change
Docker build could have failed when Dockerfile was changed and committed to master branch because the new Dockerfile was compared to itself instead of previous version.
https://jenkins.soramitsu.co.jp/job/iroha/job/iroha-hyperledger/job/master/218/consoleText
Benefits
Successful master build on Dockerfile changes
Possible Drawbacks
None