afp: set etag from mod time and fix bug when retreiving afp::children-count
afp: set etag from mod time and fix bug when retreiving afp::children-count

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