Xintao

Results 4 issues of Xintao

Let multiple tests run over different threads, meanwhile each configuration doesn't affect others. - expose `FailPointRegistry` as local registry. - `pub fn create_registry() -> FailPointRegistry` can get a new `FailPointRegistry`....

gcc toolchain: 8.3.0 debian 10 with only build-essential, cmake and libssl-dev installed. I don't install full dependency because I want `getdep` to do this. So just run `./build.sh` and got...