[commit] Clean up step-test.exp

[Andrew Cagney]

This cleans up step-test.exp.  Largely, it replaces:

	while 1 {
	    send_gdb
	    gdb_expect
	}

with

	gdb_test_multiple {
	   ...
	   -re ... {
	        send_gdb
	        exp_continue
	   }
	}

It also fixes some duplicate test messages.

Andrew
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