* lib/selftest-support.exp: New file.

	* lib/selftest-support.exp: New file.
	* gdb.gdb/complaints.exp: Load selftest-support.exp.  Use
	do_self_tests.
	(setup_test, find_gdb): Remove.
	* gdb.gdb/observer.exp: Load selftest-support.exp.  Use
	do_self_tests.
	(setup_test, find_gdb): Remove.
	(test_observer): Don't call setup_test.  Remove argument.
	* gdb.gdb/selftest.exp: Load selftest-support.exp.
	(find_gdb): Remove.
	* gdb.gdb/complaints.exp: Load selftest-support.exp.  Use
	do_self_tests.
	(setup_test, find_gdb): Remove.
	(test_with_self): Don't call setup_test.  Remove argument.