test/kms_cursor_crc: update subtests descriptions and some comments

Add descriptions for some subtests and detail a little more the comments in
test_cursor_alpha.

Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
26 jobs for master in 12 minutes and 25 seconds (queued for 2 seconds)
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  Test
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test:list-undocumented-tests

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test:test-list-diff

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test:verify-blacklists

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  Deploy
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