multipath-tcp / mptcpd / 10523034509

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Make listening socket creation optional. (#297)

In some cases, it is known in advanced that external applications have
created or will create listening sockets, and mptcpd doesn't need to do
that to avoid reporting failures because the address and port are
already in use.

This commit makes listening socket creation optional for userspace path
manager plugins by extending the API: it is now possible to call
`mptcpd_pm_add_addr_no_listener()` instead of `mptcpd_pm_add_addr()` to
announce a new address without creating a new listener socket.

Fixes #296.

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