Logging messages format non uniform

[npdgm]

We should try having a common format for all log message producers:

2024/01/09 18:08:38 maxprocs: Updating GOMAXPROCS=1: using minimum allowed GOMAXPROCS
[...]
time="2024-01-09T18:08:38Z" level=info msg="no kubeconfig file provided, attempting to load in-cluster configuration"
time="2024-01-09T18:08:38Z" level=info msg="loaded configuration, API server is at https://xxx:443"
time="2024-01-09T18:08:38Z" level=info msg="fetching API server version"
[...]
level=info ts=2024-01-09T18:08:43.865Z caller=tls_config.go:313 msg="Listening on" address=[::]:9793
level=info ts=2024-01-09T18:08:43.865Z caller=tls_config.go:316 msg="TLS is disabled." http2=false address=[::]:9793

[mobiservice19]

In JSON format