Werk #162: if_brocade: New if64 Check version for Brocade VDX Switches

This check does the same like the normal if64 check. The only difference is that ifName is used instead of ifDescription. You may want to do a reinventory on broace switches, because otherwise the "Check_MK Inventory" check (if used) will trigger warning state
cause of unchecked services.

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