app/testpmd: show mac address at initialization
app/testpmd: show mac address at initialization

Display port number and MAC address at start up.
It is useful when configuring a packet generator.

Signed-off-by: Zijie Pan <96e60a9833a2f3945af4d0b2739f70e32dd540b4@6wind.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk