Changes

testsuites: tunamp: eupf: Set correct N9 IP address

Support to configure different N9 IP address was merged upstream [1].
Use it here to get tunmap scenario working fine.

[1] https://github.com/edgecomllc/eupf/pull/585
Change-Id: Idb210554d598aebdc73e7dab8b143155a8d199eb

Change-Id: Ibc2dc19e7b27ccc94ced64fd78ffcdfd7d0269c1