nEdge recovery IP traffic should not be monitored by nEdge

[emanuele-f]

nEdge recovery IP traffic appears into the nEdge gui, and this is not good as it could possibly be dropped. This should be avoided the same way as the traffic directed to the nEdge LAN IP address.

Edit: when in VLAN trunk mode, the management interface should be excluded as well from monitoring for the same reasons as above. Update the vlan trunk docs when this is fixed.

[simonemainardi]

solution is to add an ACCEPT rule for the traffic that is destined to the nEdge machine. Such rule should be inserted in the PREROUTING chain before any other rule.

[emanuele-f]

A patch has been privately provided to @simonemainardi for testing

[simonemainardi]

Implemented.