Use os.Unsetenv in options_test
Use os.Unsetenv in options_test

Signed-off-by: Ahmet Alp Balkan <787aefc6cbd2e3e8663c1f03b44afee9126bfa5e@gmail.com>

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