Werk #6599: HW/SW Inventory: Only count the real entries

The active check {{Check_MK HW/SW Inventory}}, the inventory history and the shell commands cmk -vi and cmk -vii show the number of found entries. This number also includes the amount of nodes. Example: Hardware > System > Family: Thinkpad gives 3 entries. This may be confusing.

Now only the real entries are counted. Example: Hardware > System > Family: Thinkpad gives 1 entry.

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