[FTP] do not add double slashes when constructing relative to root
[FTP] do not add double slashes when constructing relative to root

xkahn/gvfs-cmis,xkahn/gvfs-cmis,gicmo/gvfs,philipl/gvfs,cpatulea/gvfs,xkahn/gvfs-cmis,thiblahute/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,halfline/gvfs,gicmo/gvfs,philipl/gvfs,philipl/gvfs,halfline/gvfs,thiblahute/gvfs,cpatulea/gvfs,halfline/gvfs,gicmo/gvfs