Support HTTPS URL for HTTPS_Proxy

[MrBr-github]

According to the swagger.yaml only http URL is supported for https_proxy
However starting from Open Shift 4.8 this URL can be https.

Please add support for HTTPS URLs.

apiVersion: config.openshift.io/v1
kind: Proxy
metadata:
  name: cluster
spec:
  httpProxy: http://<username>:<pswd>@<ip>:<port> 
  httpsProxy: https://<username>:<pswd>@<ip>:<port> 
  noProxy: example.com 
  readinessEndpoints:
  - http://www.google.com 
  - https://www.google.com
  trustedCA:
    name: user-ca-bundle