Migrate from glog to another log solution?

[floriankoch]

glog is not maintained since 2016 , and e.g the kubernetes project itself migrated away
They use klog now, seems like more or less a drop in replacement
https://github.com/kubernetes/klog

Should metac migrate away from glog?

If yes, which log solution?

[grzesuav]

#110

[grzesuav]

adding as it would be good to have possibility to log in json for usage with elasticsearch

[AmitKumarDas]

klog should be drop in replacement. Integration tests have them already.
I would vote for klog.

As per this example, it has all the fields needed to output in a structured format.

It will be great if community can experiment klog with json output & post the results here.

[AmitKumarDas]

As discussed, Integration Tests in metac was using klog. This PR makes use of klog with appropriate flags.