rename imports from github.com/coreos to github.com/kubernetes-incubator

[jeremyd]

Here's a rename of all the imports to use kubernetes-incubator if we want that. #450

[k8s-ci-robot]

Thanks for your pull request. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please follow instructions at https://github.com/kubernetes/kubernetes/wiki/CLA-FAQ to sign the CLA.

Once you've signed, please reply here (e.g. "I signed it!") and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please sign in with your organization's credentials at https://identity.linuxfoundation.org/projects/cncf to be authorized.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[codecov-io]

Codecov Report

Merging #451 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #451   +/-   ##
=======================================
  Coverage   41.02%   41.02%           
=======================================
  Files          38       38           
  Lines        2679     2679           
=======================================
  Hits         1099     1099           
  Misses       1420     1420           
  Partials      160      160

Impacted Files	Coverage Δ
core/controlplane/config/credential.go	59.3% <ø> (ø)	⬆️
model/derived/network.go	30.76% <ø> (ø)	⬆️
model/derived/etcd_cluster.go	80% <ø> (ø)	⬆️
core/nodepool/cluster/cluster.go	38.01% <ø> (ø)	⬆️
core/nodepool/cluster/factory.go	66.66% <ø> (ø)	⬆️
core/controlplane/config/tls_config.go	68.42% <ø> (ø)	⬆️
core/controlplane/config/token_config.go	70.53% <ø> (ø)	⬆️
cfnstack/provisioner.go	11.21% <ø> (ø)	⬆️
model/derived/etcd_node.go	0% <ø> (ø)	⬆️
core/controlplane/config/stack_config.go	70.9% <ø> (ø)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1f08f3b...fb45e90. Read the comment docs.

[mumoshu]

Good catch 👍 Thanks for the contribution @jeremyd!