enforce tensorflow<2.0 in Tensorflow MNIST Model example

[RafalSkolasinski]

This example is incompatible with Tensorflow 2.0, therefore enforcing a lower version.

[seldondev]

Hi @RafalSkolasinski. Thanks for your PR.

I'm waiting for a SeldonIO or seldonio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[RafalSkolasinski]

/assign @axsaucedo

[axsaucedo]

Nice one!
/ok-to-test
/approve
/lgtm

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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[seldondev]

Thu Dec 12 13:38:34 UTC 2019
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1251/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1251 --build=1

[seldondev]

Thu Dec 12 13:38:38 UTC 2019
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1251/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1251 --build=2