Let's look into running test-libmongoc in parallel to speed it up. Fork each test into its own process, both for parallelization and so we can continue testing after a failure. Some points:

• All of the mock server tests should be easily parallelizable
• The live tests could have conflicts with collection and database names. Use gen_test_database() and gen_test_collection() to get around this.
• To work properly, gen_test_database() must be updated to include the pid.
• failpoints are a global shared state so there needs to be a way to mark tests as non-parallelizable.
• The test runner needs to collect tests into a parallel phase and a serial phase and run tests accordingly.