[Intel-gfx] [PATCH i-g-t v5 0/7] CRC testing with Chamelium improvements

[Paul Kocialkowski]

Changes since v4:
* Moved igt_get_cairo_surface out of the thread function to properly
  handle assert failure
* Rebased on top of current master

Changes since v3:
* Renamed structure used by async crc calculation for more clarity
* Used const qualifier for untouched buffer when hashing
* Split actual calculation to a dedicated function
* Reworked async functions names for more clarity
* Reworked descriptions for better accuracy
* Exported framebuffer cairo surface and use it directly instead of
  (unused) png dumping
* Fix how the framebuffer cairo surface is obtained to avoid destroying
  it too early

* Made CRC checking logic common
* Added a check for the same number of words
* Made frame dumping configuration and helpers common
* Added an extended crc to string helper
* Added a chamelium helper for crc checking and frame dumping
* Split the merging of crc functions to a separate patch
* Added support for frame dump path global variable
* Added listing the dumped images in a file, possibly identified with
  an id global variable

The latter allows having one "dump report" file per run, possibly
identified with the id global variable, that indicates which files
are the output, while keeping the possibility to have the same files
for different runs. This allows saving significant disk space when
the images are identified with e.g. their crc, so that duplicate results
only lead to duplicate dump reports and not duplicate images.