extraEnv overwrites required environment variables

[rlabrecque]

Specifying .Values.auth.extraEnv or .Values.proxy.extraEnv overwrites the default values which are required, resulting in an error.

  extraEnv:
    - name: STATSD_HOST
      value: localhost
    - name: STATSD_PORT
      value: "11111"

Would be nice if they didn't need to be re-specified when overriding.

[bartmanus]

While this project seems abandoned, along with the buzzfeed/sso upstream, I want to add a note for any future maintainer: The current master values use the buzzfeed/sso:v3.0.0 container image. The upstream v3.0.0 proxy program configuration respects variables METRICS_STATSD_HOST and METRICS_STATSD_PORT.

Farewell, archeologist!