Document pre-req for manageTLS: runtime must load certificates

[leochr]

manageTLS mounts the certificates onto the runtime pods, but the runtime is responsible for loading the mounted certificates. Liberty containers load the certificates automatically into the default keystore / truststore at container startup. tWAS runtime doesn't have such equivalence. Document that the inorder for manageTLS to work end-to-end, runtime must load the certs.

Document this in the limitation / troubleshooting section

[tam512]

The current workaround to install tWAS applications using RCO v1.2.0 is to use spec.route.termination: edge with insecureEdgeTerminationPolicy: Redirect or insecureEdgeTerminationPolicy: Allow or spec.route.termination: passthrough

For example:

spec:
  manageTLS: false
  route:
    termination: edge
    insecureEdgeTerminationPolicy: Redirect
  service:
    type: ClusterIP
    port: 9080