Add intergration testing for kfserving

[jinchihe]

/kind feature

Describe the solution you'd like Since the kfserving will be intergrated by https://github.com/kubeflow/fairing/pull/299. But the testing platform is not installed kfserving, so the cases will be failed. Firstly we should ensure the testing platform has kfserving then add some tests. May the kfserving will be installed with kubeflow installation, but need to confirm.

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

[issue-label-bot[bot]]

Issue-Label Bot is automatically applying the label improvement/enhancement to this issue, with a confidence of 0.99. Please mark this comment with :thumbsup: or :thumbsdown: to give our bot feedback!

Links: app homepage, dashboard and code for this bot.

[jinchihe]

/assign @jinchihe

[jinchihe]

We also need to make an end to end case for kfserving, from training model to serving using kfserving. Kfserving is going to support PVC case and reading model from local, will do this once that done. Thanks. /cc @karthikv2k

[jtfogarty]

/priority p2 /area engprod