Add go1.9 target to travis
Add go1.9 target to travis

So that we can start testing with it

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