e5f90ac654
Automatic merge from submit-queue (batch tested with PRs 57919, 58021, 58020, 58023). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add GCE "Custom" folder **What this PR does / why we need it**: Allows creating clusters with image type custom **Special notes for your reviewer**: **Release note**: ```release-note NONE ``` This will need to be cherrypicked back to the 1.9 branch /assign @dchen1107 @yguo0905