Log configuration values for OVS agent

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

Change-Id: I00bc82a3dafbd214a2ddbdf525dd4cc327838af9
Closes-bug: #1285962
Remove vim line from db migartion template

This commit also empties __init__.py and removes vim
modelines in the db migration related codes.

Change-Id: I9f83109c5becb6cf7e2e6ad9ad8eb9af3d8e0972
Closes-Bug: #1286991
Merge "Remove vim line from db migartion template"
Merge "Log configuration values for OVS agent"