grafana security, bug fix, and enhancement update

[6.7.4-3]

• apply patch for CVE-2020-13430 also to sources, not only to compiled webpack
  [6.7.4-2]
• security fix for CVE-2020-13430
  [6.7.4-1]
• update to 6.7.4 tagged upstream community sources, see CHANGELOG
• security fix for CVE-2020-13379
  [6.7.3-1]
• update to 6.7.3 tagged upstream community sources, see CHANGELOG
• add scripts to list Go dependencies and bundled npmjs dependencies
• set Grafana version in Grafana UI and grafana-cli --version
• declare README.md as documentation of datasource plugins
• create grafana.db on first installation (fixes RH BZ #1805472)
• change permissions of /var/lib/grafana to 750 (CVE-2020-12458)
• change permissions of /var/lib/grafana/grafana.db to 640 and
  user/group grafana:grafana (CVE-2020-12458)
• change permissions of grafana.ini and ldap.toml to 640 (CVE-2020-12459)
  [6.6.2-1]
• added patch0 to set the version string correctly
• removed patch 004-xerrors.patch, its now upstream
• added several patches for golang vendored vrs build dep differences
• added patch to move grafana-cli binary to libexec dir
• update to 6.6.2 tagged upstream community sources, see CHANGELOG