BUG/MINOR: server: fix the format of the warning on address change

When the server address is changed, a message with unrequired '\n' or
'.' is displayed, like this:

   [WARNING] 054/101137 (3229) : zzzz/s3 changed its IP from 127.0.0.1 to ::55 by stats command
   .

This patch remove the '\n' which is sent before the '.'.

This patch must be backported in 1.6
1 file changed