[PATCH v7] app/testpmd: monitor state of primary process when using secondary

[Khadem Ullah]

Hi Vipin,
Glad you got the reason.
I have only checked it in testpmd, any other application which provides
primary-secondary support could also follow the same model.
This patch only adds stability and robustness to primary-secondary
applications. Primary applications can be closed, quit or shutdown
by various reasons while secondary end-up with dangling pointers.
Without the primary application, the secondary could not do any rx or tx.
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