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2845f10a2be0fee13b2772d24e948052243782b8 test: extend FreeBSD ephemeral port range fix to P2P listeners (node) 34bed0ed8c449a3834927cec3447dbe6c74edf3d test: use IP_PORTRANGE_HIGH on FreeBSD for dynamic port allocation (woltx) Pull request description: Reopening #34336. I’ve now tested it on FreeBSD and confirmed it works. On FreeBSD, the default ephemeral port range (10000-65535) overlaps with the test framework's static port range (11000-26000), possibly causing intermittent "address already in use" failures when tests use dynamic port allocation (`port=0`). This PR adds a helper that sets `IP_PORTRANGE_HIGH` via `setsockopt()` before binding, requesting ports from 49152-65535 instead, which avoids the overlap, as suggested in https://github.com/bitcoin/bitcoin/issues/34331#issuecomment-3767161843 by @maflcko . From FreeBSD's [sys/netinet/in.h](https://cgit.freebsd.org/src/tree/sys/netinet/in.h): ```c #define IP_PORTRANGE 19 #define IP_PORTRANGE_HIGH 1 #define IPPORT_EPHEMERALFIRST 10000 /* default range start */ #define IPPORT_HIFIRSTAUTO 49152 /* high range start */ ``` See also: FreeBSD https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4 man page. Fixes #34331 ACKs for top commit: vasild: ACK 2845f10a2be0fee13b2772d24e948052243782b8 hebasto: ACK 2845f10a2be0fee13b2772d24e948052243782b8, I have reviewed the code and it looks OK. Tree-SHA512: ce501ce3e8a4023e07bad572df2b85d6829becf133813e4529aebba83e4eba59fa8b48e9d2197ebbb226adaf3054fad720775a787244d6b38c0078ee086102f4