Bump version to 4.10.9; Update ChangeLog.
Merge remote-tracking branch 'origin/collectd-4.10' into collectd-5.1

Conflicts:
	ChangeLog
	version-gen.sh
Bump version to 5.1.3; Update ChangeLog.
Merge branch 'collectd-5.1' into collectd-5.2

Conflicts:
	ChangeLog
	version-gen.sh
Bump version to 5.2.2; Update ChangeLog.