feature #3782: remove duplicate code in qcow2 snap_create
feature #3782: remove duplicate code in qcow2 snap_create

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