lower the loglevel for the informational message that a TCP_ADD opeation

lower the loglevel for the informational message that a TCP_ADD opeation
described an ip address not known to be a public address.

This could happen if someone for genuine reasons accesses a share
through a static ip address.
It can also happen if non homogenous public address configurations are
used and when a tcp description is pushed out to a different node that
does not server/know the specific ip address.