Lower logger level in OF1.0 Discovery Service
- Discovery Service has a function to attempt to snoop
non controller generated or malformed LLDP frames.
The whole function block is in a try catch block,
as exceptions are well expected.
In case an exception is hit though, the function logs
it as a warn.
- Change the log level to debug, do not print a stack trace,
print the source MAC and the port on which it was received.
Change-Id: I82b459b16356b0a57934b3c26c993d20a2b53dc2
Signed-off-by: Alessandro Boch <aboch@cisco.com>