upgrade invoker docker client to 1.12.0
upgrade invoker docker client to 1.12.0

issue put docker version in env var

markusthoemmes/openwhisk,jasonpet/openwhisk,domdom82/openwhisk,prccaraujo/openwhisk,style95/openwhisk,RSulzmann/openwhisk,jeremiaswerner/openwhisk,cbickel/openwhisk,markusthoemmes/openwhisk,sven-lange-last/openwhisk,markusthoemmes/openwhisk,houshengbo/openwhisk,openwhisk/openwhisk,rabbah/openwhisk,dubeejw/openwhisk,CrowdFlower/incubator-openwhisk,starpit/openwhisk,jasonpet/openwhisk,lzbj/openwhisk,dubeejw/openwhisk,markusthoemmes/openwhisk,sven-lange-last/openwhisk,cbickel/openwhisk,houshengbo/openwhisk,xin-cai/openwhisk,domdom82/openwhisk,duynguyen/incubator-openwhisk,paulcastro/openwhisk,jasonpet/openwhisk,csantanapr/incubator-openwhisk,duynguyen/incubator-openwhisk,starpit/openwhisk,sven-lange-last/openwhisk,style95/openwhisk,jasonpet/openwhisk,tysonnorris/openwhisk,paulcastro/openwhisk,jeremiaswerner/openwhisk,sven-lange-last/openwhisk,jasonpet/openwhisk,jeremiaswerner/openwhisk,csantanapr/incubator-openwhisk,RSulzmann/openwhisk,markusthoemmes/openwhisk,devbv/incubator-openwhisk,tysonnorris/openwhisk,akrabat/openwhisk,duynguyen/incubator-openwhisk,style95/openwhisk,csantanapr/incubator-openwhisk,csantanapr/incubator-openwhisk,prccaraujo/openwhisk,style95/openwhisk,akrabat/openwhisk,CrowdFlower/incubator-openwhisk,CrowdFlower/incubator-openwhisk,dubeejw/openwhisk,sven-lange-last/openwhisk,jasonpet/openwhisk,nwspeete-ibm/openwhisk,xin-cai/openwhisk,domdom82/openwhisk,rabbah/openwhisk,nwspeete-ibm/openwhisk,prccaraujo/openwhisk,dubeejw/openwhisk,openwhisk/openwhisk,prccaraujo/openwhisk,prccaraujo/openwhisk,houshengbo/openwhisk,nwspeete-ibm/openwhisk,RSulzmann/openwhisk,domdom82/openwhisk,rabbah/openwhisk,nwspeete-ibm/openwhisk,jasonpet/openwhisk,devbv/incubator-openwhisk,tysonnorris/openwhisk,jeremiaswerner/openwhisk,RSulzmann/openwhisk,lzbj/openwhisk,nwspeete-ibm/openwhisk,cbickel/openwhisk,RSulzmann/openwhisk,paulcastro/openwhisk,CrowdFlower/incubator-openwhisk,markusthoemmes/openwhisk,lzbj/openwhisk,jeremiaswerner/openwhisk,style95/openwhisk,houshengbo/openwhisk,starpit/openwhisk,houshengbo/openwhisk,sven-lange-last/openwhisk,cbickel/openwhisk,paulcastro/openwhisk,paulcastro/openwhisk,style95/openwhisk,openwhisk/openwhisk,lzbj/openwhisk,RSulzmann/openwhisk,openwhisk/openwhisk,tysonnorris/openwhisk,devbv/incubator-openwhisk,akrabat/openwhisk,markusthoemmes/openwhisk,dubeejw/openwhisk,xin-cai/openwhisk,akrabat/openwhisk,tysonnorris/openwhisk,duynguyen/incubator-openwhisk,akrabat/openwhisk,style95/openwhisk,jeremiaswerner/openwhisk,rabbah/openwhisk,rabbah/openwhisk,RSulzmann/openwhisk,sven-lange-last/openwhisk,rabbah/openwhisk,tysonnorris/openwhisk,rabbah/openwhisk,paulcastro/openwhisk,csantanapr/incubator-openwhisk,csantanapr/incubator-openwhisk,domdom82/openwhisk,CrowdFlower/incubator-openwhisk,akrabat/openwhisk,lzbj/openwhisk,prccaraujo/openwhisk,prccaraujo/openwhisk,devbv/incubator-openwhisk,csantanapr/incubator-openwhisk,domdom82/openwhisk,lzbj/openwhisk,xin-cai/openwhisk,xin-cai/openwhisk,dubeejw/openwhisk,paulcastro/openwhisk,openwhisk/openwhisk,cbickel/openwhisk,jeremiaswerner/openwhisk,CrowdFlower/incubator-openwhisk,houshengbo/openwhisk,devbv/incubator-openwhisk,starpit/openwhisk,nwspeete-ibm/openwhisk,akrabat/openwhisk,starpit/openwhisk,openwhisk/openwhisk,starpit/openwhisk,tysonnorris/openwhisk,duynguyen/incubator-openwhisk,cbickel/openwhisk,markusthoemmes/openwhisk,cbickel/openwhisk,xin-cai/openwhisk,houshengbo/openwhisk,nwspeete-ibm/openwhisk