bug #4349: do not use ln -r in qcow2 clone
bug #4349: do not use ln -r in qcow2 clone

This ln parameter is not available in CentOS 6

hsanjuan/one,juanmont/one,hsanjuan/one,atodorov-storpool/one,unistra/one,unistra/one,ohamada/one,goberle/one,hsanjuan/one,OpenNebula/one,abelCoronado93/one,goberle/one,baby-gnu/one,juanmont/one,OpenNebula/one,atodorov-storpool/one,OpenNebula/one,alvarosimon/one,OpenNebula/one,abelCoronado93/one,hsanjuan/one,OpenNebula/one,unistra/one,juanmont/one,ohamada/one,ohamada/one,hsanjuan/one,atodorov-storpool/one,baby-gnu/one,juanmont/one,juanmont/one,abelCoronado93/one,atodorov-storpool/one,atodorov-storpool/one,juanmont/one,atodorov-storpool/one,unistra/one,abelCoronado93/one,OpenNebula/one,alvarosimon/one,OpenNebula/one,goberle/one,abelCoronado93/one,goberle/one,ohamada/one,baby-gnu/one,goberle/one,baby-gnu/one,goberle/one,alvarosimon/one,atodorov-storpool/one,abelCoronado93/one,unistra/one,baby-gnu/one,abelCoronado93/one,ohamada/one,juanmont/one,OpenNebula/one,baby-gnu/one,hsanjuan/one,goberle/one,baby-gnu/one,baby-gnu/one,juanmont/one,unistra/one,alvarosimon/one,atodorov-storpool/one,OpenNebula/one,hsanjuan/one,unistra/one,ohamada/one,alvarosimon/one,alvarosimon/one,alvarosimon/one,abelCoronado93/one,ohamada/one,hsanjuan/one,goberle/one,atodorov-storpool/one,ohamada/one,unistra/one,juanmont/one,alvarosimon/one