Log the network configuration
Log the network configuration

To better troubleshooting networking issues, it is
better to log the configuration of the network that
is going to be created. We should have a debug statement
to show at least the "options" and "ipam_options".

Change-Id: Ibcf9731eb1b8b2e9c09a93a22b1af6bbdc86d528
Closes-Bug: #1695779

kevin-zhaoshuai/zun,kevin-zhaoshuai/zun,kevin-zhaoshuai/zun