msg/Pipe: do not wait for self in Pipe::stop_and_wait()

The fast dispatch code necessitated adding a wait for the fast dispatch to
complete when taking over sockets back in commit 
2d5d3097c3998add1061ce253104154d72879237.  This included mark_down()
(although I am not certain mark_down was required to fix the previous set of
races).

In any case, if the fast dispatch thread itself tries to mark down its own
connection, it will deadlock in this method waiting for itself to return and
clear reader_dispatching.  Skip this wait if we are in fact the reader
thread.  This avoids the deadlock.

Alternatively, we could change mark_down() to not use stop_and_wait(), but I
am less clear about the potential races there, so I'm opting for the minimal
(though ugly) fix.

Fixes: #9057 Signed-off-by: Sage Weil <sage@redhat.com>