gdb/testsuite/

gdb/testsuite/
	* gdb.base/completion.exp (directory completion): Create the directory.
	New variables uniquedir, escapeduniquedir, uniquesu, uniquesub,
	escapeuniquesub.
	(directory completion 2): Expect now ${escapeuniquesub}.
	(Glob remaining of directory test): Remove one excessive newline.
	Expect the real output.