Remove verbosity from ui_out_message and friends

Remove verbosity from ui_out_message and friends

That concept is never actually used, so it's just a burden.  Removing it
facilitates the refactoring in upcoming patches.

gdb/ChangeLog:

	* mi/mi-out.c (mi_message): Remove verbosity argument.
	* ada-tasks.c (print_ada_task_info, info_task, task_command):
	Update call.
	* auto-load.c (auto_load_info_scripts): Likewise.
	* breakpoint.c (breakpoint_1, watchpoints_info, tracepoints_info):
	Likewise.
	* cli-out.c (cli_message): Remove verbosity argument.
	* inferior.c (print_inferior): Update call.
	* linux-thread-db.c (info_auto_load_libthread_db): Likewise.
	* probe.c (info_probes_for_ops): Likewise.
	* skip.c (skip_info): Likewise.
	* solib.c (info_sharedlibrary_command): Likewise.
	* symfile.c (load_progress): Likewise.
	* thread.c (print_thread_info_1): Likewise.
	* ui-out.c (uo_message, ui_out_message): Remove verbosity argument.
	(ui_out_get_verblvl): Remove.
	* ui-out.h (ui_out_message): Remove verbosity argument.
	(ui_out_get_verblvl): Remove.
	(message_ftype): Remove verbosity argument.