Convert FSAL_LUSTRE from export object to namespace object

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Convert FSAL_GLUSTER from export object to namespace object

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
MORE Convert FSAL_VFS from export object to namespace object

I missed one reference to export that should be namespace

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
MORE Convert FSAL_PROXY from export object to namespace object

I missed one reference to export that should be namespace

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Cleanup after rename of fsal_export to fsal_namespace

Remove the #defines that allow un-converted FSALs to still compile.

Change all instances of NAMESPACE to namespace now that the macro
conversion of namespace to export no longer exists.

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>