Werk #3905: barracuda_mailqueues, nullmailer_mailq, postfix_mailq, qmail_stats: these checks now have items, postfix can now monitor multi directories (linux agent)

If postfix is configured with multi directories then the linux agent provides information about deferred and active mail queue length of these directories.

Note: The existing ruleset mailqueue length is now deprecated. These checks will work further on but the related ruleset won't be applied any more except the default levels. To make these new checks work, please 1. rediscover the affected hosts 2. use new mail queue length ruleset and 3. enable "use new service description" for these checks below global settings.

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