Fix for issue 7902.
Use utils.RFC3339NanoFixed ("2006-01-02T15:04:05.000000000Z07:00")
instead of time.RFC3339Nano to format our log timestamps - this way
things are aligned, in particular the nano seconds are padded with zeros

Signed-off-by: Doug Davis <dug@us.ibm.com>
Merge pull request #7976 from duglin/Issue7902

Fix for issue 7902 - add trailing zeros to timestamps so logs align