Implement fallback version for query attr methods when not supported.
Implement fallback version for query attr methods when not supported.

Original git commit by Alexander Larsson <alexl@redhat.com> at 1183735231 +0200

svn path=/trunk/; revision=677

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