HPCC-12169 Minor MP/Jsocket tracing improvements

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
This change (and the removal of the similar one on line 2464) was in fact the main motivation behind this PR.

This line of logging was being spewed every time a socket closed that was not part of the communicator.
As a result, every time a MP client closed all the communicators spewed a message.
End result, a lot of noise.

NB: these lines of logging was relatively new and added to help diagnose issues we were seeing on IB clusters. But the other lines added at that time were more meaningful.