更新readme说明、更新pom依赖镜像地址、删除 mvn -o 命令

[yang872546]

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[ks-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[yang872546]

/assign @shaowenchen 我已经添加了DCO SINGOFF ,

[ks-ci-bot]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• 5dffd1f Update Jenkinsfile-online
• 18f8dcd Update README.md
• 3a3d3a0 Update README.md
• 2621917 Update pom.xml
• 67d4a96 Update pom.xml

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[zryfish]

/assign @shaowenchen 我已经添加了DCO SINGOFF ,

Your PR contains 8 commits, but ks-ci-bot found 5 commits missing dco-signoff. I suggest squash those commits into one, and push again