grafana-pcp security and enhancement update

5.1.1-1 - update to 5.1.1 tagged upstream community sources, see CHANGELOG - resolve CVE-2022-27664 golang: net/http: handle server errors after sending GOAWAY 5.0.0-4 - update to 5.0.0 tagged upstream community sources, see CHANGELOG - install plugin in /usr/share and create symlink from /var...