Werk #15091: check_mk_agent: Add option "--force-inventory" in order to collect the output of the mk_inventory agent plugin

Sometimes the full agent output, ie. the output of the agent itself and of all installed agent plugins, of a host is needed for debugging or simulation purposes.

Especially collecting the output of the agent plugin "mk_inventory" is not very user-friendly because the execution depends on a special flag file. A user has to delete or modified this flag file in order to get the output. In general this intervention is not a good idea because it steps in the Checkmk operations.

With the new option "--force-inventory" the output of "mk_inventory" is collected and the Checkmk operations are not bothered anymore.

Example: check_mk_agent --force-inventory > host.out

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