tests: test runner script now understands also .msglst files
tests: test runner script now understands also .msglst files

These are basically identical to .lst files, but sjasmplus is made to
output list into STDERR and that output is collected + compared with the
.msglst file.

This is internal thing to test --msg=lstlab option, for ordinary tests
the old ".lst" is still recommended.

z00m128/sjasmplus,z00m128/sjasmplus,z00m128/sjasmplus