Merge branch 'Extend-testptp-with-PTP-perout-waveform'

Vladimir Oltean says:

====================
Extend testptp with PTP perout waveform

Demonstrate the usage of the newly introduced flags in the
PTP_PEROUT_REQUEST2 ioctl:

https://www.spinics.net/lists/netdev/msg669346.html
====================

Signed-off-by: David S. Miller <davem@davemloft.net>