parallels: process '/' mount point correctly for containers
parallels: process '/' mount point correctly for containers

Since we are going to add block devices as root disks we have
to specify root mount point for boot block devices. But we
shouldn't do this if a filesystem disk with such
target mount point already exists.

Signed-off-by: Maxim Nestratov <3521c777060d1ad4ae08bba7eb9d80264eaeb236@parallels.com>

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