Sunstone: remove SOURCE from image creation dialog.
Sunstone: remove SOURCE from image creation dialog.

Make the necessary changes so it can be specified as custom attribute still.
(cherry picked from commit 613fb144ab7c7f31e018f450a4a86247d04ea5d9)

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