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35840bf71e
Automatic merge from submit-queue (batch tested with PRs 58300, 58530, 57942, 58543). 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>. Ability to specify OS_* variables for OpenStack configuration **What this PR does / why we need it**: When we convert the OpenStack cloud provider to run in an external process, we should be able to use kubernetes Secrets capability to inject the OS_* variables. This way we can specify the cloud configuration as a configmap, specify secrets for the userid/password information. The configmap can be mounted as a file. the secrets can be made available as environment variables. the external controller itself can run as a pod/daemonset. For backward compat, we preload all the OS_* variables, if anything is in the config file, then that overrides the environment variables. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # **Special notes for your reviewer**: **Release note**: ```release-note Authentication information for OpenStack cloud provider can now be specified as environment variables ```