stdlib: loosen testcases

Stabilize tests for all kind of machines

Old sparc (and newer smaller) machines timeouts in 'random_ref_comp'
decrease load and increase timeouts.

Supervisor:
Turn up accepted time, since if non-linear it should be much worse,
now the test failes on slow multicore machines

Remove memory tests, they fail sometimes and those tests are not
needed to be tested. Hard to predict GC's and other processes behaviours.

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