conf: rename virDomainPCIAddressGetNextSlot() to ...GetNextAddr()
conf: rename virDomainPCIAddressGetNextSlot() to ...GetNextAddr()

With the advent of VIR_PCI_CONNECT_AGGREGATE_SLOT, the new name is
more appropriate, since the address returned may be another address
on the same slot as last time, not necessarily a new slot.

fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,taget/libvirt,datto/libvirt,jardasgit/libvirt,zippy2/libvirt,crobinso/libvirt,eskultety/libvirt,VenkatDatta/libvirt,crobinso/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,datto/libvirt,fabianfreyer/libvirt,crobinso/libvirt,VenkatDatta/libvirt,zippy2/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,zippy2/libvirt,eskultety/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,eskultety/libvirt,datto/libvirt,libvirt/libvirt,olafhering/libvirt,taget/libvirt,olafhering/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,jardasgit/libvirt,libvirt/libvirt,taget/libvirt,andreabolognani/libvirt,taget/libvirt,eskultety/libvirt,olafhering/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,datto/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,fabianfreyer/libvirt,taget/libvirt,jardasgit/libvirt,crobinso/libvirt,datto/libvirt,andreabolognani/libvirt,jardasgit/libvirt