- Updated reference of legacy FSF address with currently recommended way to get actual copy of GPL 2.
- Replaced "Percona Ireland Ltd." and other old Percona names with "Percona LLC and/or it affiliates"
- Updated copyright year for these outdated entries
- Updated documentation for pt-eustack-resolver and pt-pmp
- Added pt-eustack-resolver, pt-pmp and other missed tools into docs/percona-toolkit.pod
- Removed quickstack support from pt-pmp. We do not need to port this
improvement, because quickstack is not actively developed and does not
create useful stack traces for Percona Server for MySQL 8.0.