fac942ca57dce6cfa5655a3ac8664d6a051bc01f test: Remove fragile assert_memory_usage_stable (MarcoFalke)
Pull request description:
This test fails on arm64 and a fuzz tests seems inappropriate for the functional test suite anyway, so remove it. Example failures: * https://travis-ci.org/bitcoin/bitcoin/jobs/611497963#L14517 * https://travis-ci.org/MarcoFalke/bitcoin-core/jobs/611029104#L3876
ACKs for top commit:
jamesob: ACK https://github.com/bitcoin/bitcoin/pull/17469/commits/fac942ca57dce6cfa5655a3ac8664d6a051bc01f
Backport of Core PR17469
I've skipped backporting Core PR14794 which attempts to fix the issue using a not-so-robust approach of
looking at env variables to determine if the memory usage threshold should be modified.
This fixes sanitizer failures on CI by removing the problem entirely.