Add a doc to describe how to use kops in AWS China
Add a doc to describe how to use kops in AWS China

Closes #2933, #3282.

blakebarnett/kops,mad01/kops,justinsb/kops,justinsb/kops,aledbf/kops,pdh/kops,andrewsykim/kops,aledbf/kops,robinpercy/kops,tsupertramp/kops,andrewsykim/kops,mad01/kops,andrewsykim/kops,andrewsykim/kops,robinpercy/kops,blakebarnett/kops,robinpercy/kops,kubernetes/kops,kubernetes/kops,pdh/kops,pdh/kops,gambol99/kops,pdh/kops,tsupertramp/kops,chrislovecnm/kops,mad01/kops,robinpercy/kops,tsupertramp/kops,gambol99/kops,tsupertramp/kops,mad01/kops,blakebarnett/kops,gambol99/kops,gambol99/kops,chrislovecnm/kops,justinsb/kops,blakebarnett/kops,kubernetes/kops,aledbf/kops,aledbf/kops,chrislovecnm/kops,chrislovecnm/kops