Remove python27 jobs from neutron dashboard
Remove python27 jobs from neutron dashboard

Python 2.7 jobs were removed from Neutron CI with patch [1].
So it's also good to clean it from Neutron Grafana dashboard.

[1] https://review.opendev.org/#/c/686833/

Change-Id: If7081f6b25f9e510126ba1f835360f89b9122b39

openstack-infra/project-config,openstack-infra/project-config