BUG/MEDIUM: stream: don't use localtime in dumps from a signal handler

BUG/MEDIUM: stream: don't use localtime in dumps from a signal handler

In issue #2861, Jarosaw Rzeszótko reported another issue with
"show threads", this time in relation with the conversion of a stream's
accept date to local time. Indeed, if the libc was interrupted in this
same function, it could have been interrupted with a lock held, then
it's no longer possible to dump the date, and we face a deadlock.
This is easy to reproduce with logging enabled.

Let's detect we come from a signal handler and do not try to resolve
the time to localtime in this case.