integration helpers: add start_with_busybox
integration helpers: add start_with_busybox

starts an engine with a preloaded busybox without pulling (much faster).

Signed-off-by: Andrea Luzzardi <442ffe3ffbfd024afcf0b7f8b108d05bca3aae43@gmail.com>

denverdino/denverdino.github.io,MHBauer/swarm,kunalkushwaha/swarm,linecheng/swarm,gdevillele/docker.github.io,denverdino/denverdino.github.io,errordeveloper/swarm,jzwlqx/denverdino.github.io,megamsys/swarm,danix800/docker.github.io,denverdino/denverdino.github.io,raoofm/swarm,CiaranCostello/swarm,johnstep/docker.github.io,Spritekin/swarm,alexisbellido/docker.github.io,FollowMyDev/swarm,londoncalling/docker.github.io,CodeNow/swarm,thaJeztah/docker.github.io,gdevillele/docker.github.io,troy0820/docker.github.io,akerbis/armhf-swarm,BSWANG/swarm,denverdino/swarm,jzwlqx/denverdino.github.io,docker/docker.github.io,yp-engineering/swarm,jzwlqx/denverdino.github.io,londoncalling/docker.github.io,gdevillele/docker.github.io,cgvarela/swarm,unodba/swarm,shin-/docker.github.io,atlassian/swarm,shahankhatch/swarm,denverdino/docker.github.io,docker-zh/docker.github.io,menglingwei/denverdino.github.io,CiaranCostello/swarm,joaofnfernandes/docker.github.io,denverdino/docker.github.io,LukasBacigal/swarm,mrjana/swarm,johnstep/docker.github.io,shubheksha/docker.github.io,barais/swarm,FreedomWangLi/swarm,cpuguy83/swarm,rav121/swarm,ricca742/swarm,troy0820/docker.github.io,yp-engineering/swarm,JimGalasyn/docker.github.io,LukasBacigal/swarm,gdevillele/docker.github.io,phiroict/docker,BSWANG/denverdino.github.io,jimmyxian/swarm,mavenugo/swarm,qianzhangxa/swarm,shubheksha/docker.github.io,EderRoger/swarm,kyhavlov/swarm,aduermael/docker.github.io,francisbouvier/swarm,bdwill/docker.github.io,sfsmithcha/swarm,parapsyche/swarm,mgoelzer/swarm,rajdeepd/swarm,parapsyche/swarm,troy0820/docker.github.io,pssahi/swarm,polyverse-security/swarm,docker/docker.github.io,adouang/swarm,joeuo/docker.github.io,shin-/docker.github.io,christophelec/swarm,CodeNow/swarm,londoncalling/docker.github.io,pdevine/swarm,affo/swarm,shin-/docker.github.io,iaintshine/swarm,ejholmes/swarm,atlassian/swarm,krystism/swarm,everett-toews/swarm,therealbill/swarm,MHBauer/swarm,fugr/swarm,megamsys/swarm,londoncalling/docker.github.io,jdamick/swarm,denverdino/docker.github.io,shubheksha/docker.github.io,bpradipt/swarm,mrjana/swarm,rajdeepd/swarm,errordeveloper/swarm,akerbis/armhf-swarm,beni55/swarm-1,alexisbellido/docker.github.io,jay-lau/swarm,rchicoli/swarm,u2mejc/swarm,thaJeztah/docker.github.io,kunalkushwaha/swarm,mgoelzer/swarm,echupriyanov/swarm,Aorjoa/swarm,menglingwei/denverdino.github.io,phiroict/docker,denverdino/docker.github.io,joeuo/docker.github.io,BSWANG/denverdino.github.io,moxiegirl/swarm,docker/docker.github.io,sfsmithcha/swarm,tangkun75/swarm,echupriyanov/swarm,christophelec/swarm,affo/swarm,adouang/swarm,sanscontext/docker.github.io,rav121/swarm,ejholmes/swarm,PeoplePerHour/libswarm,abronan/swarm,joaofnfernandes/docker.github.io,zkcrescent/swarm,auzias/swarm,bdwill/docker.github.io,ezrasilvera/SwarmACLs,thaJeztah/docker.github.io,sanscontext/docker.github.io,riuvshin/swarm,denverdino/swarm,gdevillele/docker.github.io,u2mejc/swarm,jimmycmh/swarm,therealbill/swarm,JimGalasyn/docker.github.io,londoncalling/docker.github.io,rancher/swarm,LuisBosquez/docker.github.io,phiroict/docker,xFragger/swarm,ezrasilvera/SwarmACLs,troy0820/docker.github.io,swarm-hooks/swarm,shin-/docker.github.io,NunoEdgarGub1/swarm,aduermael/docker.github.io,menglingwei/denverdino.github.io,ealang/swarm,bpradipt/swarm,francisbouvier/swarm,shot/swarm,moxiegirl/swarm,docker/docker.github.io,shin-/docker.github.io,dims/swarm,sanscontext/docker.github.io,shubheksha/docker.github.io,JimGalasyn/docker.github.io,tangkun75/swarm,jay-lau/swarm,allencloud/swarm,ch3lo/swarm,thaJeztah/docker.github.io,tranceitionalMynd/swarm,anweiss/docker.github.io,LuisBosquez/docker.github.io,qianzhangxa/swarm,denverdino/denverdino.github.io,NunoEdgarGub1/swarm,gradywang/swarm,denverdino/swarm-1,fugr/swarm,cpuguy83/swarm,jeffjen/swarm,johnstep/docker.github.io,joaofnfernandes/docker.github.io,vlajos/swarm,FreedomWangLi/swarm,alexisbellido/docker.github.io,dnephin/swarm,ricca742/swarm,LuisBosquez/docker.github.io,raoofm/swarm,phiroict/docker,sanscontext/docker.github.io,cgvarela/swarm,alexisbellido/docker.github.io,denverdino/docker.github.io,joeuo/docker.github.io,rancher/swarm,everett-toews/swarm,bdwill/docker.github.io,vlajos/swarm,unodba/swarm,doronp/swarm,rillig/docker.github.io,docker/docker.github.io,joeuo/docker.github.io,ehazlett/swarm,docker-zh/docker.github.io,JimGalasyn/docker.github.io,joaofnfernandes/docker.github.io,menglingwei/denverdino.github.io,alexisbellido/docker.github.io,ezrasilvera/swarm,jimmycmh/swarm,rutulpatel/swarm,srikalyan/swarm,liubin/swarm,sanscontext/docker.github.io,denverdino/swarm-1,johnstep/docker.github.io,linecheng/swarm,denverdino/denverdino.github.io,jdamick/swarm,Aorjoa/swarm,EderRoger/swarm,ch3lo/swarm,bsmr-docker/swarm,rillig/docker.github.io,xFragger/swarm,PeoplePerHour/libswarm,pdevine/swarm,BSWANG/denverdino.github.io,krystism/swarm,barais/swarm,bdwill/docker.github.io,rillig/docker.github.io,aduermael/docker.github.io,dims/swarm,joaofnfernandes/docker.github.io,liubin/swarm,BSWANG/denverdino.github.io,gonkulator/swarm,BSWANG/swarm,docker-zh/docker.github.io,auzias/swarm,thaJeztah/docker.github.io,rutulpatel/swarm,anweiss/docker.github.io,shubheksha/docker.github.io,morpheyesh/swarm,jeffjen/swarm,aduermael/docker.github.io,jzwlqx/denverdino.github.io,rillig/docker.github.io,srikalyan/swarm,swarm-hooks/swarm,doronp/swarm,pssahi/swarm,morpheyesh/swarm,danix800/docker.github.io,iaintshine/swarm,rchicoli/swarm,snrism/swarm,gonkulator/swarm,docker-zh/docker.github.io,schmunk42/swarm,resouer/swarm,danix800/docker.github.io,jzwlqx/denverdino.github.io,snrism/swarm,dnephin/swarm,LuisBosquez/docker.github.io,bdwill/docker.github.io,zkcrescent/swarm,joeuo/docker.github.io,ealang/swarm,anweiss/docker.github.io,abronan/swarm,BSWANG/denverdino.github.io,mavenugo/swarm,riuvshin/swarm,anweiss/docker.github.io,Spritekin/swarm,anweiss/docker.github.io,jimenez/swarm,ezrasilvera/swarm,allencloud/swarm,JimGalasyn/docker.github.io,FollowMyDev/swarm,jimmyxian/swarm,danix800/docker.github.io,kyhavlov/swarm,phiroict/docker,schmunk42/swarm,bsmr-docker/swarm,docker-zh/docker.github.io,jimenez/swarm,shot/swarm,polyverse-security/swarm,shahankhatch/swarm,johnstep/docker.github.io,tranceitionalMynd/swarm,resouer/swarm,menglingwei/denverdino.github.io,beni55/swarm-1,gradywang/swarm,ehazlett/swarm,LuisBosquez/docker.github.io