Use GatewayKernelManager from Jupyter Server when gateway is enabled

[kevin-bates]

I recently integrated HTTPKernelManager (and HTTPKernelClient) from Elyra into Jupyter Server as GatewayKernelManager (and GatewayKernelClient) via this pull request that was recently released in Jupyter Server 1.7.0. This pull request replaces our use of HTTPKernelManager/Client with GatewayKernelManager/Client.

How was this pull request tested?

I built the master branch of Elyra and targetted an Enterprise Gateway server with a local pipeline - confirming Elyra and EG integration was working using HTTPKernelManager. I then applied these changes and re-confirmed the local pipeline still completed successfully and the logs (on both servers) reflected the expected results.

Resolves #1649

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[elyra-bot]

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[lresende]

Always good to see less code and enhanced functionality !!!