Downgrade kubernetes dependency to 1.10.1

[richardsliu]

This is to ensure that tf-operator can be imported to katib. Katib uses controller-runtime which is compatible with k8s 1.10.1. Tf-operator uses 1.10.0 (upgrading to 1.11.2 breaks a lot of things).

This change is 

[richardsliu]

/assign @YujiOshima
/assign @gaocegege
/assign @johnugeorge

[johnugeorge]

/lgtm

[gaocegege]

/lgtm

[YujiOshima]

Removing DeletePropagationForeground has a big side effect.
We need to be careful.
/hold

[richardsliu]

/retest

[richardsliu]

@YujiOshima Please take another look at this change. This is a short term solution until we figure out a better solution for managing dependencies across repos.

The flaws of this solution are:

• Pods created by the batch jobs must be deleted manually;
• Need to allow studyjob-controller to delete pods in the namespace (unsafe but no worse than what the metrics collector is already doing).

Let me know what you think.

[richardsliu]

/retest

[YujiOshima]

@richardsliu Thank you for your hard work!
/hold cancel

[YujiOshima]

/lgtm
/approve

[k8s-ci-robot]

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