conf: more useful error message when pci function is out of range
If a pci address had a function number out of range, the error message would be: Insufficient specification for PCI address which is logged by virDevicePCIAddressParseXML() after virDevicePCIAddressIsValid returns a failure. This patch enhances virDevicePCIAddressIsValid() to optionally report the error itself (since it is the place that decides which part of the address is "invalid"), and uses that feature when calling from virDevicePCIAddressParseXML(), so that the error will be more useful, e.g.: Invalid PCI address function=0x8, must be <= 7 Previously, virDevicePCIAddressIsValid didn't check for the theoretical limits of domain or bus, only for slot or function. While adding log messages, we also correct that ommission. (The RNG for PCI addresses already enforces this limit, which by the way means that we can't add any negative tests for this - as far as I know our domainschematest has no provisions for passing XML that is supposed to fail). Note that virDevicePCIAddressIsValid() can only check against the absolute maximum attribute values for *any* possible PCI controller, not for the actual maximums of the specific controller that this device is attaching to; fortunately there is later more specific validation for guest-side PCI addresses when building the set of assigned PCI addresses. For host-side PCI addresses (e.g. for <hostdev> and for network device pools), we rely on the error that will be logged when it is found that the device doesn't actually exist. This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1004596
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