Description of problem:

Sometimes, after a new JL notebook has been spawned, the user is notified with an error message which says: 

"Error Starting Kernel
Invalid response: 504 Gateway Time-out"

When you click on the "OK" button, it asks you to select a kernel.

Prerequisites (if any, like setup, operators/versions):

install RHODS

install OpenVINO

Steps to Reproduce

1. spawn a jupyter lab server using OpenVINO image
2. create two notebooks
3. save them
4. stop the JL server
5. spawn again a jupyter lab server using OpenVINO image
6. wait a couple of minutes to see the error message       

Actual results:

"Error Starting Kernel
Invalid response: 504 Gateway Time-out"

Expected results:

no errors

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

RHODS v1.1.1-57

Workaround:

Additional info:

1. it seems to happen when there are multiple jupyter notebook files opened from previous sessions. 
2. I checked on other notebook images like tensorflow or SDS without hitting it. Hence, I targeted this bug to OpenVINO image