simple changes in gdb.base

simple changes in gdb.base

This makes more changes in gdb.base to make it parallel-safe.  I think
the changes in this particular patch are relatively straightforward,
so I've grouped them all together.

2013-11-04  Tom Tromey  <tromey@redhat.com>

	* gdb.base/advance.exp: Use standard_testfile and
	prepare_for_testing.
	* gdb.base/bigcore.exp: Use standard_output_file.  "cd" to
	appropriate directory when local.
	* gdb.base/dump.exp: Use standard_output_file.  Update all
	"dump" and "restore" filenames.
	* gdb.base/interact.exp: Use standard_output_file.
	* gdb.base/jit-so.exp: Don't download file when local.
	* gdb.base/jit.exp (compile_jit_test): Don't download file
	when local.
	* gdb.base/list.exp: Use gdb_remote_download.
	* gdb.base/maint.exp: Use standard_output_file.
	* gdb.base/prelink.exp: Use standard_output_file.
	* gdb.base/save-bp.exp: Use standard_output_file.
	* gdb.base/sepdebug.exp: Use standard_testfile,
	standard_output_file.
	(test_different_dir): Don't declare objdir.
	* gdb.base/solib-search.exp: Use standard_output_file.
	* gdb.base/step-line.exp: Use gdb_remote_download.
	* gdb.base/trace-commands.exp: Use standard_output_file.