conf: limit chassisNr, and busNr to a minimum value of 1, not 0
In the case of chassisNr (used to set chassis_nr of a pci-bridge controller), 0 is reserved for / used by the pci[e]-root bus. In the base of busNr, a value of 0 would mean that the root bus had no places available to plug in new buses, including the pxb itself (the documentation I wrote for pxb even noted the limit of busNr as 1.254). NB: oddly, the "chassis" attribute, which is used for pcie-root-port and pcie-switch-downstream-port *can* be set to 0, since it's the combination of {chassis, slot} that needs to be unique, not chassis by itself (and slot 0 of pcie-root is reserved, while pcie-*-port can use *only* slot 0). This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1342962
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