os-net-config: log at log level info again...

We standardized the logging options in os-net-config in
I31005e4e10372018685a93dc2f80619f16c513d9. Previously
os-net-config was functionally logging at the info level
however, which is what we want.

This patch switches all the os-net-config commands to use
-v INFO level logging again.

Change-Id: Ia90a83da27cd4767425c4913fd150d5df5c3163e