Automatic merge from submit-queue (batch tested with PRs 52376, 52439, 52382, 52358, 52372)
Pass correct clientbuilder to cloudproviders
Fixes https://github.com/kubernetes/kubeadm/issues/425 by moving the Initialize call to after the start of the token controller and passing `clientBuilder` instead of `rootClientBuilder` to the cloudproviders.
/assign @bowei
**Release note**:
```release-note
NONE
```
Should fix in 1.8 and cherrypick to 1.7
d9615b2fd1