Werk #15949: omd update reports etc/omd/allocated_ports as obsolete and changed

During an update from 2.1.0 to 2.2.0, users might have encountered the following message:

Changes in obsolete file etc/omd/allocated_ports
The file etc/omd/allocated_ports has become obsolete in the new version, but
you have changed its contents. Do you want to keep your file or may I remove
it for you, please?

keep        keep your file, though it is obsolete
remove      remove your file
shell       Open a shell for looking around
abort       Stop here and abort update!

This file can be safely removed. Furthermore, as of this werk, this message will not be displayed anymore.

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