NS_Emulation: Add CTRL port to administratively disable a NS-VC

This feature is useful in simulating intermittent or permanent transport network
outage by simply halting processing of all rx+tx in the specified NS-VC
until it is administratively re-enabled.

Change-Id: I742ecf01de15e3edbf0719371f0217a5739b7c8e
RelateD: OS#4521
1 file changed