Switch from deprecated MAINTAINER tag to LABEL with maintainer's info in Dockerfile (#6429)
Switch from deprecated MAINTAINER tag to LABEL with maintainer's info in Dockerfile (#6429)

Motivation & Modification
The MAINTAINER instruction is deprecated in favor of the LABEL instruction with the maintainer's info in docker files.
merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar