Code is copied from ndn-cxx:commit:e1c8c4cfffb33dca13c8ca7d7ef04c7401a7cbef,
(gerrit change-id Ieea485c0ebdce9fb9c876cad005cb95fd8e0c899)
with minor changes for changing include paths and building script.
Change-Id: I77b94fe69b20f04c338e7be7387125f709fa9e1a
Refs: #3018
As a sample, this commit also includes a test suite for
ndn::ping::client::StatisticsCollector class.
refs #2795
Change-Id: Ia0c7522ae26bee1cc9d172c7379ab62f84325ed7