server: Always try return a named pipe server that is listening from find_available_server.

[Robert Shearman]

We still fallback to an idle server, but this prevents a client from 
connecting to a named pipe server that isn't listening.
---
  server/named_pipe.c |   11 ++++++++++-
  1 files changed, 10 insertions(+), 1 deletions(-)
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