Include clientId in agent log output

[hawksight]

We seem to dump all the config out when the agent starts up in Venafi Kubernetes Agent. This is useful for debugging.
But we are missing one important piece when connecting to TLSPK on VCP, the client-id.

This is passed in the deployment rather than config here:

    spec:
      containers:
      - args:
        - agent
        - -c
        - /etc/venafi/agent/config/config.yaml
        - --client-id
        - XXXXX-f707-11ee-922c-XXXXXXX
        - -p
        - 0h1m0s
        - --venafi-cloud
        - --enable-metrics

It would be useful to also have this logged on startup.

[wallrj]

In #564 @maelvls removed the log message containing the configuration.

I'll see if the client-id can be logged here instead:

jetstack-secure/pkg/agent/config.go

Lines 380 to 382 in f644b84

	case flags.ClientID != "" && flags.PrivateKeyPath != "":
	mode = VenafiCloudKeypair
	reason = fmt.Sprintf("Using the %s auth mode since --client-id and --private-key-path were specified.", mode)