Add wait to config write test
Add wait to config write test

It is possible that cloud credential is not
immediately available. Prior, this would cause
the test to fail. Now, create will be retried if
the credential is unavailable.

cjellick/rancher,rancher/rancher,cjellick/rancher,rancher/rancher,cjellick/rancher,rancherio/rancher,rancher/rancher,rancherio/rancher,rancher/rancher