test: improve color management test in imagebufalgo_test #4063
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Add a few more assertion checks and error messages in imagebufalgo_test.
I observe that if somebody runs the testsuite with
$OCIO
set to a config that doesn't contain the required color space names for this test, it will fail. As a backstop, use the default built-in config if the initial request fails. That will always give a working processor between these spaces if OCIO >= 2.2 is being used.Also one more tiny SPI-specific enhancement to hacky identification of nonconforming color space names in our old configs.