server: expand known context names for native driver config

Ryan Neph requested to merge ryanneph/virglrenderer:ctx-name-expansion into master

Guest Linux kernel's virtgpu driver only gets 15 chars of the guest application name via get_task_comm(). While a better method is devised to send the full name, do host-side substring expansion for known apps that must have app-specific native driver configuration applied.

Signed-off-by: Ryan Neph

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