Look for default service account before marking cluster ready

Changelog for 0.13.9:

Commits
a1700f6 Update vendor by @alexellis
9096f9f Look for default service account before marking cluster ready by @alexellis
9f541fe Cancel concurrent builds by @alexellis
77ea3fe Create request-a-feature.md by @alexellis
8066e16 Update issue templates by @alexellis

Changes: 0.13.8...0.13.9

Generated by Derek