Remove thread from ilog

[mvandeberg]

In our logging for appbase we see lines of the form 'parse error: Invalid numeric literal at line 1, column 7'

This is due to the thread name portion of the log file. We are now using boost threads instead of fc threads and some of the assumptions of the format of the thread are incorrect. This can lead to printing of non-ASCII characters. I suggest removing this part of the log message.