Move the stderr output of event log messages in verbose mode to the

Move the stderr output of event log messages in verbose mode to the
general logging module rather than localising it in ssh.c. This
means it should work in other protocols as well (notably Telnet,
where it might actually be useful for debugging negotiations).

git-svn-id: svn://svn.tartarus.org/sgt/putty@2360 cda61777-01e9-0310-a592-d414129be87e