tests/test-username-newline.out

Improvement to 14ce129cfcd: Use try/except and pass filename on errors

Without the second part, the error message would be
  abort: Is a directory
instead of
  abort: Is a directory: /home/user/.cvspass

adding a
abort: username 'foo\nbar1' contains a newline

abort: username 'foo\nbar2' contains a newline

transaction abort!
rollback completed
abort: username 'foo\nbar3' contains a newline!