Fix libcgroup dependency typo
Fix libcgroup dependency typo

In nodeup/pkg/model/docker.go, libcgroup is listed as a dependency for various environments. A couple times this is misspelled as libgcroup
kubernetes/kops,aledbf/kops,justinsb/kops,gambol99/kops,blakebarnett/kops,tsupertramp/kops,mad01/kops,blakebarnett/kops,justinsb/kops,justinsb/kops,gambol99/kops,tsupertramp/kops,aledbf/kops,aledbf/kops,gambol99/kops,robinpercy/kops,robinpercy/kops,aledbf/kops,robinpercy/kops,kubernetes/kops,andrewsykim/kops,blakebarnett/kops,tsupertramp/kops,robinpercy/kops,andrewsykim/kops,andrewsykim/kops,chrislovecnm/kops,mad01/kops,chrislovecnm/kops,gambol99/kops,kubernetes/kops,mad01/kops,chrislovecnm/kops,blakebarnett/kops,andrewsykim/kops,tsupertramp/kops,mad01/kops,chrislovecnm/kops