Log configuration values for OFA agent

When other agents start up, they log the configuration values
to their logs. This patch adds the same feature to the
Openflow agent.

fixes bug 1289139

Change-Id: Ibab20154805a12ec265a2499cbfd6c376c376130
(cherry picked from commit 7d1e49a08a170ecf4e2546b25c67d4a8d41fd34a)
Merge "Log configuration values for OFA agent" into milestone-proposed