Previously the plugins initialization was done for the apiserver
config only, which enabled admission for core resources handled by
the apiserver, but the extensions server lacked the admission chain
and did not apply webhooks to CRDs

Fix missing gitMajor and gitMinor

See merge request !9

Add OpenID connect authentication to apiserver

Closes #16

See merge request !8

This adds two separate config flags both for the issuer and client id,
while the username claim and prefix are hardcoded. If configuration
flags are not specified, no OIDC authentication is enabled.

Enable proxy authentication to the apiserver

See merge request !6

Proxy authentication is required for the qpiserver
to properly authenticate against aggregated services, like some
webhooks