Fix test_rollback_to_stable10 conflict between concurrent operations in cursor update

unit-test failed on OS X 10.12

Host: macos-1012-83.macstadium.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-6840 Add support for fuzzing with LLVM LibFuzzer (#6101)

This commit contains my initial attempt at adding support for fuzz testing with LLVM LibFuzzer to WiredTiger. This includes:

• Documentation outlining how to build and run fuzzers, implement new targets, and view fuzzing coverage.
• A fuzzutil library with some common helpers for initializing global state and slicing inputs.
• A fuzz_config target which fuzzes configuration parsing logic.
• A fuzz_modify target which fuzzes modify processing logic.
• Helpers scripts fuzz_run.sh and fuzz_coverage.sh to run fuzzers with sensible defaults and get coverage information (which is useful for developing new targets). | 03 Feb 21 12:38 UTC
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