Update to latest version of kubeflow/common

[terrytangyuan]

There have been good amount of enhancements in kubeflow/common but no interface change yet so here we only update the go.sum file.

Signed-off-by: terrytangyuan terrytangyuan@gmail.com

[kubeflow-bot]

This change is 

[Jeffwan]

@terrytangyuan

There's some breaking changes actually. I think somehow it uses old version in the build.

https://github.com/kubeflow/common readme has updated API names.

https://github.com/kubeflow/tf-operator/pull/1152/files has some package name changes, not not exact same project since xgboost not only use api but also implementation

[merlintang]

/lgtm

[merlintang]

/approve

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[terrytangyuan]

@Jeffwan Looks like the problem is that we have Gopkg.* files in the repo. I am deleting them in #48 and revert the update of kubeflow/common. We can update later when kubeflow/common is more stable.