pg_amcheck: Try to fix still more test failures.
Avoid use of non-portable option ordering in command_checks_all().
The use of bare command line arguments before switches doesn't work
everywhere. Per buildfarm members drongo and hoverfly.
Avoid testing for the message "role \"%s\" does not exist", because
some buildfarm machines report a different error. fairywren complains
about "SSPI authentication failed for user \"%s\"", for example.
Mark Dilger
Discussion: http://postgr.es/m/
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Discussion: http://postgr.es/m/
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