Add RSE to FTS-ASO metadata 7960

[cmsdmwmbot]

Jenkins results:

• Python3 Pylint check: succeeded
  • 9 comments to review
• Pycodestyle check: succeeded
  • 4 comments to review

Details at https://cmssdt.cern.ch/dmwm-jenkins/view/All/job/DMWM-CRABServer-PR-test/1999/artifact/artifacts/PullRequestReport.html

[belforte]

Tested on crab-dev-tw01 Now FTS dashboard has RSE info for ASO as well https://monit-grafana.cern.ch/goto/hyxEaPPIg?orgId=11