Alessandro Rubini authored Mar 08, 2012 and Aurelio Colosimo committed Mar 09, 2012

This moves some constants from pptp.h to constansts.h and
adds DEFAULT_ETHERNET_MODE, so archs can activate it by default for them

Note that default management is awfully broken (we inherited from the
other ptpd). For example DEFAULT_INBOUND_LATENCY is not used, and if
you change it you have no effect.