18340629 ptpd needs a way to enable or disable logging

Following patch adds the capability to enable or disable logging via SMF service

diff -ur ptpd-2.2.0/src/ptpd2.8 /builds/pjalan/ptp-userland/components/ptp/ptpd-2.2.0/src/ptpd2.8
--- ptpd-2.2.0/src/ptpd2.8	Mon Mar 10 01:46:23 2014
+++ /builds/pjalan/ptp-userland/components/ptp/ptpd-2.2.0/src/ptpd2.8	Fri Mar  7 11:01:09 2014
@@ -133,6 +133,11 @@
 A string specifying the location of the file  used  for
 log output. The default is /var/log/ptp.log
 .TP
+.BR config/enable_logging
+A boolean which when true, instructs ptpd to log
+synchronization and other related information in the file
+specified by config/logfile. Default value is false.
+.TP
 .BR  config/other_options
 A string specifying other command line options mentioned
 below to be passed to svc:/network/ptp:default at startup.