mobile: use the fully qualified Docker image name
mobile: use the fully qualified Docker image name

Change-Id: Id9875cd07d18f6ca96ac64fd0b4537d69457d72c
Reviewed-on: https://go-review.googlesource.com/2922
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

samanalysis/mobile,samanalysis/mobile,DanielWorld/mobile,cainiaocome/mobile,steeve/mobile,ppamorim/mobile,tempbottle/mobile,golang/mobile,b54898533/mobile,ichu501/mobile,DanielWorld/mobile,golang/mobile,freeman0211/mobile,ichu501/mobile,xing/gomobile,qskycolor/mobile,lonphy23t/mobile,ichu501/mobile,freeman0211/mobile,qskycolor/mobile,qskycolor/mobile,0x90sled/mobile,ichu501/mobile,DanielWorld/mobile,0x90sled/mobile,xing/gomobile,goldcaddy77/mobile,xing/gomobile,MaxCy330/mobile,goldcaddy77/mobile,tempbottle/mobile,ppamorim/mobile,ppamorim/mobile,zach-klippenstein/mobile,MaxCy330/mobile,cainiaocome/mobile,tempbottle/mobile,goldcaddy77/mobile,goldcaddy77/mobile,b54898533/mobile,samanalysis/mobile,steeve/mobile,samanalysis/mobile,golang/mobile,xing/gomobile,ppamorim/mobile,zach-klippenstein/mobile,MaxCy330/mobile,golang/mobile,cainiaocome/mobile,lonphy23t/mobile,swisspol/mobile,cainiaocome/mobile,swisspol/mobile,freeman0211/mobile,DanielWorld/mobile,swisspol/mobile,swisspol/mobile,freeman0211/mobile,MaxCy330/mobile,xing/gomobile,steeve/mobile,samanalysis/mobile,0x90sled/mobile,goldcaddy77/mobile,tempbottle/mobile,0x90sled/mobile,lonphy23t/mobile,tempbottle/mobile,lonphy23t/mobile,lonphy23t/mobile,qskycolor/mobile,ichu501/mobile,swisspol/mobile,0x90sled/mobile,b54898533/mobile,steeve/mobile,zach-klippenstein/mobile,MaxCy330/mobile,ppamorim/mobile,cainiaocome/mobile,zach-klippenstein/mobile,b54898533/mobile,b54898533/mobile