Pyjunis does not support fatjar compiled with java 11

When I compile with java 11 and use the fat-jar in pyjunis, some errors happen.

```
SystemError: Error calling dlopen(b'/home/p8shi/jdk-11.0.4/jre/lib/amd64/server/libjvm.so': b'/home/p8shi/jdk-11.0.4/jre/lib/amd64/server/libjvm.so: cannot open shared object file: No such file or directory'
```
