Save the Logger output as plain text, not JSON

This file is sent in when an event log is created to be used as FFDC.
The output is smaller and also slightly easier to read when it is in a
text file of the form:  <timestamp>: <messsage>.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I5e9953f150cc1478251f3e2131e8b3e548ed1274
3 files changed