qemu: snapshot: Remove monitor code now that 'transaction' is always used
qemu: snapshot: Remove monitor code now that 'transaction' is always used

Since we now always do the snapshot via the 'transaction' command we can
drop the code which would enter monitor for individual disk snapshots.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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