mkpj: turn off label separation instead of relabelling
mkpj: turn off label separation instead of relabelling

Relabelling directories on the host OS could have unforseen
consequences - e.g. preventing something on the host OS from accessing
the directory - so it's arguably safer to just turn off label
separation using --security-opt="label=disable".

jessfraz/test-infra,cblecker/test-infra,cjwagner/test-infra,kubernetes/test-infra,BenTheElder/test-infra,BenTheElder/test-infra,cblecker/test-infra,cjwagner/test-infra,cblecker/test-infra,dims/test-infra,dims/test-infra,BenTheElder/test-infra,kubernetes/test-infra,cjwagner/test-infra,jessfraz/test-infra,cjwagner/test-infra,cjwagner/test-infra,kubernetes/test-infra,cjwagner/test-infra,dims/test-infra,jessfraz/test-infra,BenTheElder/test-infra,BenTheElder/test-infra,kubernetes/test-infra,BenTheElder/test-infra,cblecker/test-infra,michelle192837/test-infra,kubernetes/test-infra,jessfraz/test-infra,jessfraz/test-infra,kubernetes/test-infra,dims/test-infra,michelle192837/test-infra,michelle192837/test-infra,dims/test-infra,michelle192837/test-infra,michelle192837/test-infra,michelle192837/test-infra,cblecker/test-infra,dims/test-infra,jessfraz/test-infra,cblecker/test-infra