feature #471: Fix IP6 prefix generation
feature #471: Fix IP6 prefix generation

abelCoronado93/one,cloudweavers/one,cloudweavers/one,cloudweavers/one,goberle/one,fasrc/one,alvarosimon/one,dberzano/opennebula-torino,mattthias/one,unistra/one,alvarosimon/one,unistra/one,ohamada/one,juanmont/one,OpenNebula/one,OpenNebula/one,ggalancs/one,OpenNebula/one,ggalancs/one,fasrc/one,spirit03/one,atodorov-storpool/one,tuxmea/one,cloudweavers/one,OpenNebula/one,baby-gnu/one,atodorov-storpool/one,Terradue/one,unistra/one,goberle/one,spirit03/one,dberzano/opennebula-torino,goberle/one,ggalancs/one,OpenNebula/one,dberzano/opennebula-torino,tuxmea/one,fasrc/one,mattthias/one,juanmont/one,fasrc/one,dberzano/opennebula-torino,baby-gnu/one,tuxmea/one,abelCoronado93/one,juanmont/one,OpenNebula/one,baby-gnu/one,hsanjuan/one,goberle/one,hsanjuan/one,tuxmea/one,atodorov-storpool/one,spirit03/one,atodorov-storpool/one,atodorov-storpool/one,ggalancs/one,hsanjuan/one,hsanjuan/one,mattthias/one,tuxmea/one,unistra/one,baby-gnu/one,Terradue/one,dberzano/opennebula-torino,mattthias/one,abelCoronado93/one,unistra/one,atodorov-storpool/one,tuxmea/one,spirit03/one,fasrc/one,unistra/one,ggalancs/one,Terradue/one,baby-gnu/one,Terradue/one,Terradue/one,OpenNebula/one,cloudweavers/one,alvarosimon/one,tuxmea/one,alvarosimon/one,cloudweavers/one,abelCoronado93/one,alvarosimon/one,OpenNebula/one,baby-gnu/one,hsanjuan/one,juanmont/one,alvarosimon/one,Terradue/one,unistra/one,abelCoronado93/one,juanmont/one,dberzano/opennebula-torino,atodorov-storpool/one,goberle/one,goberle/one,Terradue/one,ohamada/one,hsanjuan/one,alvarosimon/one,goberle/one,spirit03/one,mattthias/one,alvarosimon/one,ggalancs/one,atodorov-storpool/one,cloudweavers/one,mattthias/one,fasrc/one,ohamada/one,ggalancs/one,unistra/one,juanmont/one,abelCoronado93/one,spirit03/one,abelCoronado93/one,ohamada/one,dberzano/opennebula-torino,abelCoronado93/one,atodorov-storpool/one,ohamada/one,OpenNebula/one,ohamada/one,mattthias/one,fasrc/one,fasrc/one,tuxmea/one,juanmont/one,ggalancs/one,spirit03/one,hsanjuan/one,juanmont/one,goberle/one,hsanjuan/one,juanmont/one,baby-gnu/one,baby-gnu/one,ohamada/one,cloudweavers/one,Terradue/one,spirit03/one,mattthias/one,ohamada/one