examples/ipsec-secgw: fix TAP default MAC address

Default TAP mac address was changed in below commit. Hence, updated IPsec test script to reflect changes.

Fixes: c3006be2 ("net/tap: set locally administered bit for fixed MAC address") Cc: stable@dpdk.org

Signed-off-by: Vladimir Medvedkin vladimir.medvedkin@intel.com Acked-by: Stephen Hemminger stephen@networkplumber.org