add missing source file in cd pipeline to this repo

[jayl1e]

metioned in PR: https://github.com/PingCAP-QE/ci/pull/2443

• [ ] upload-pipeline-run-data-to-db: unknown file agent_tibuild_pipeline_run.py // hold
• [ ] send_notify: unknown file agent-jenkinsci.py // hold

metioned in PR: https://github.com/PingCAP-QE/ci/pull/2450

• [x] manifest-multiarch-common: unknown file manifest-tool

gethash: referenced in many pipelines:

• [x] add gethash.py to git
• [ ] refract all pipeline using gethash.py with credential

[wuhuizuo]

manifest-tool is a open source tool.