Fixes bug #555: Re-selecting disk none does not reset Swap/FS specific fields.
Fixes bug #555: Re-selecting disk none does not reset Swap/FS specific fields.

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