qemu: Shorten domain name for watchdog coredump
qemu: Shorten domain name for watchdog coredump

Similarly to commit d294f6b0dff7, if the name is long enough, the
filename can be longer than filesystem's limit.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1334237

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

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