[PATCH] dts: add dpdk shell warm up period

[Luca Vizzarro]

Hi Patrick,

Perfectly understand the situation, I am just afraid that adding a whole 
5 seconds every time an InteractiveShell is spawned may slow down 
everything by a lot. These are spawned a lot of times, so it will stack 
up. Is there no other way to test for readiness?

Also I think we are providing the ability to run shells outside the 
context manager as well for some scenarios where it's needed, so this 
approach won't cover that case unfortunately.

Best,
Luca