daemon: Rename copy to copyFunc
daemon: Rename copy to copyFunc

"copy" can be misleading for humans because Go has its own builtin "copy" function

Signed-off-by: Akihiro Suda <ea940da7e429af3d0d0c18296cabd0112a36bad5@lab.ntt.co.jp>

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onczj/moby-json-file-logger,mstanleyjones/docker,justyntemme/docker,pradipd/moby,kunalkushwaha/docker,eskaaren/docker,troy0820/docker.github.io,amatsus/docker,Syntaxide/docker,aduermael/docker.github.io,bdwill/docker.github.io,mkumatag/docker,cpuguy83/docker,srust/docker,bluebreezecf/docker,zhuguihua/docker,tmp6154/docker,justyntemme/docker,laijs/moby,laijs/docker,13W/docker,bearstech/moby,joaofnfernandes/docker.github.io,rremer/moby,nawawi/docker,lixiaobing10051267/docker,mtanlee/docker,joeuo/docker.github.io,dsau/docker,jongiddy/docker,medallia/docker,kolyshkin/moby,jongiddy/docker,djs55/docker,gnailuy/docker,tagomoris/docker,jimjag/docker,jzwlqx/denverdino.github.io,containers/storage,moby/moby,denverdino/denverdino.github.io,yasiramin10p/moby,bonczj/moby-json-file-logger,gschaetz/moby,dsheets/moby,sfsmithcha/docker,gjaskiewicz/moby,anweiss/docker.github.io,troy0820/docker.github.io,fcrisciani/docker,gschaetz/moby,aduermael/docker.github.io,dperny/docker,mohmost12/docker,danix800/docker.github.io,amatsus/docker,raja-sami-10p/moby,tianon/docker,whuwxl/docker,HuKeping/docker,xiekeyang/docker,pecameron/docker,cpuguy83/docker,prertik/docker,q384566678/docker,moypray/docker,noxiouz/docker,jimjag/docker,dperny/docker,medallia/docker,jwhonce/docker,erikstmartin/docker,ibuildthecloud/docker,michelvocks/docker,ndeloof/docker,jlhawn/docker,msabansal/docker,thaJeztah/docker.github.io,trebonian/docker,PatrickLang/moby,thaJeztah/docker,sfsmithcha/docker,shubheksha/docker.github.io,catinthesky/docker,lixiaobing1/docker,AkihiroSuda/docker,asbjornenge/docker,allencloud/docker,mixja/docker,asbjornenge/docker,johnstep/docker.github.io,LuisBosquez/docker.github.io,HideoYamauchi/docker,charleswhchan/docker,mtesselH/docker,dongjoon-hyun/docker,michael-holzheu/docker,thtanaka/docker,LuisBosquez/docker.github.io,shin-/docker.github.io,liaoqingwei/docker,alfred-landrum/docker,danyalKhaliq10p/moby,tophj-ibm/docker,cloudflare/docker,alfred-landrum/docker,dnephin/docker,unclejack/docker,brahmaroutu/docker,stevvooe/docker,shishir-a412ed/docker,ColinHebert/docker,docker/docker.github.io,jameszhan/docker,BSWANG/denverdino.github.io,abhinavdahiya/docker,AkihiroSuda/docker,konstruktoid/docker-upstream,13W/docker,jzwlqx/denverdino.github.io,srust/docker,menglingwei/denverdino.github.io,vdemeester/docker,JimGalasyn/docker.github.io,cyphar/docker,bdwill/docker.github.io,estesp/docker,ffoysal/docker,dgageot/docker,amatsus/docker,HuKeping/docker,pramodhkp/moby,madhanrm/docker,AkihiroSuda/docker,yongtang/docker,alexisbellido/docker.github.io,tophj-ibm/moby,bdwill/docker.github.io,darrenstahlmsft/moby,flavio/docker,miminar/docker,jlebon/docker,stainboy/docker,laijs/docker,KarthikNayak/docker,msabansal/docker,toli/docker,paralin/docker,gdevillele/docker.github.io,hqhq/moby,unclejack/docker,tophj-ibm/moby,mahak/docker,erikh/docker,kencochrane/docker,rillig/docker.github.io