Fix Comm::TcpAcceptor::status() reporting of listening address #1891
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Buggy "static" caching optimization led to TcpAcceptor X reporting
listening address of TcpAcceptor Y or an incorrect 0.0.0.0 address.
TcpAcceptor status is visible in mgr:jobs and level-5+ debugs() output.
Side effect: For a listening port configured without an explicit IP
address, the listening address part of status() is now reported using
"[::]" rather than "0.0.0.0" string.
Broken since 2011 commit cbff89b.