increase pseudorandom data in system tests

Evan Hunt requested to merge systest-entropy into v9_12
  • use randomdev=/dev/urandom in gitlab CI
  • in tests that use genrandom, generate more data (4k, increased from 800 bytes) so tests that need more won't hang
  • set this in conf.sh as RANDOMSIZE so it can be changed in one location

This is for 9.12 and 9.11.

Edited by Evan Hunt

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