message: Fix logging for real
  Summary:
  I made some amends right before landing {D4751279} that didn't quite
  hit the mark. In particular we would not strip the REDEX tag if TRACE was set
  to something like "3,REDEX:1". This fixes it up.
diff: @@ -58,7 +58,7 @@ def strip_trace_tag(env):
  trace = parse_trace_string(env['TRACE'])
  trace.pop('REDEX')
  if ALL in trace:
  - trace_str = trace['ALL']
  + trace_str = str(trace[ALL])
  trace.pop(ALL)
  else:
  trace_str = ''
  