vboxDumpNetwork: use virMacAddrParseHex
vboxDumpNetwork: use virMacAddrParseHex

Use the virMacAddrParse helper that does not require colon-separated
values instead of using extra code to format it that way.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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