Enhancement
- upgrade golang version to 1.9.7.
- add new troubleshooting API for dumping go-routines stack trace.
- replaced runc binary which built from rancher CVE Github repository.
- adjusted default graph driver priority for better usage on CentOS 7.
BUG Fixes
- Fixed FD leak after running wrong command in the exec session.
Others
- rebuild new CI on Github actions.
- make RPM package only on CentOS 7 system.