parallels: Set the first HDD from XML as bootable
parallels: Set the first HDD from XML as bootable

1. Delete all boot devices for VM instance
2. Find the first HDD from XML and set it as bootable

Now we support only one boot device and it should be HDD.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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