Implement setting xattrs
Implement setting xattrs

Original git commit by Alexander Larsson <alexl@redhat.com> at 1187790186 +0200

svn path=/trunk/; revision=752

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