toollib: initialize handles (including reporting for selection) for _select_match_* used in process_each_* fns

Call _init_processing_handle, _init_selection_handle and
_destroy_processing_handle in process_each_* and related functions to
set up and destroy handles used while processing items.

tools/vgcfgbackup.c

@@ -96,5 +96,6 @@ int vgcfgbackup(struct cmd_context *cmd, int argc, char **argv)
 
 	init_pvmove(0);
 
+	destroy_processing_handle(cmd, &handle, 0);
 	return ret;
 }