When PVC is 100% full, it becomes impossible to use the notebook

Description of problem:

If a user fills up the PVC to 100%, the kernel keeps dying. Restarting the pods does nothing. Nothing works. the only thing that works is to open a terminal and delete stuff to make some space. 

But a user would not know that. 

Apparently, on top of that, the Admin would not be notified. (https://access.redhat.com/documentation/en-us/red_hat_openshift_data_science/1/html-single/release_notes/index#bug-fixes_RHODS-5822_relnotes) 

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Steps to Reproduce

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Reproducibility (Always/Intermittent/Only Once):

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