Fix vdc refresh button
Fix vdc refresh button

The refresh action in the VDC pluging requested the list of Zones instead of the list of VDCs.

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