afs: Implement network namespacing

Implement network namespacing within AFS, but don't yet let mounts occur
outside the init namespace.  An additional patch will be required propagate
the network namespace across automounts.

Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/cell.c

@@ -528,7 +528,7 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
 					     NULL, 0,
 					     cell, 0, true);
 #endif
-	ret = afs_proc_cell_setup(net, cell);
+	ret = afs_proc_cell_setup(cell);
 	if (ret < 0)
 		return ret;
 	spin_lock(&net->proc_cells_lock);
@@ -544,7 +544,7 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
 {
 	_enter("%s", cell->name);
 
-	afs_proc_cell_remove(net, cell);
+	afs_proc_cell_remove(cell);
 
 	spin_lock(&net->proc_cells_lock);
 	list_del_init(&cell->proc_link);