document and narrow usage of criu tests

[judovana]

I'm unable to run https://github.com/adoptium/aqa-tests/tree/master/external/*criu* tests. Is there some additional documentation? If no, can it be written?

In addition, it seems that those test are bound to only very specific subset of jvms, and images. That is causing quite intensive if-elif-elif-elif....fi.fi.fi in the external scripts.

• Instead of this, can they simply exit if incorrect combination is set?
• There seems to be mechanism, which allows to move to much vendor-tight tests out of main repo. Is this applicable here?
  • The main runners would lost osme weight

Thoughts please? Maye I'm just missing some part of history or documentation, but some pointers would be helpfull