Send the trivial-backtrace test output to log file instead of *terminal-io*.
Send the trivial-backtrace test output to log file instead of *terminal-io*.

d35h/cl-test-grid,cl-test-grid/cl-test-grid,cl-test-grid/cl-test-grid,cl-test-grid/cl-test-grid,cl-test-grid/cl-test-grid,cl-test-grid/cl-test-grid,d35h/cl-test-grid