Besu support

[dknopik]

We want to support the execution layer client Besu.

We seem to require suport for SO_REUSEADDR, as Besu incorrectly claims that the port is already occupied. Furthermore, there are more warnings logged by shadow:

Log

00:00:03.348554 [126508:shadow-worker] 00:00:05.022849390 [WARN] [node6:29.251.164.100] [mod.rs:602] [shadow_rs::host::syscall::handler] (LOG_ONCE) Detected unsupported syscall times (100) called from thread 1023 in process java on host node6
00:00:04.740233 [126508:shadow-worker] 00:00:05.031794670 [WARN] [node6:29.251.164.100] [udp.rs:642] [shadow_rs::host::descriptor::socket::inet::udp] (LOG_ONCE) We do not yet handle ioctl request SIOCGIFCONF on tcp sockets
00:00:04.828432 [126508:shadow-worker] 00:00:05.032529800 [WARN] [node6:29.251.164.100] [legacy_tcp.rs:1110] [shadow_rs::host::descriptor::socket::inet::legacy_tcp] (LOG_ONCE) getsockopt called with unsupported level 6 and opt 12
00:00:04.828511 [126508:shadow-worker] 00:00:05.032533800 [WARN] [node6:29.251.164.100] [legacy_tcp.rs:1110] [shadow_rs::host::descriptor::socket::inet::legacy_tcp] (LOG_ONCE) getsockopt called with unsupported level 6 and opt 4
00:00:04.828585 [126508:shadow-worker] 00:00:05.032537800 [WARN] [node6:29.251.164.100] [legacy_tcp.rs:1110] [shadow_rs::host::descriptor::socket::inet::legacy_tcp] (LOG_ONCE) getsockopt called with unsupported level 1 and opt 56
00:00:04.831917 [126508:shadow-worker] 00:00:05.032584380 [WARN] [node6:29.251.164.100] [udp.rs:965] [shadow_rs::host::descriptor::socket::inet::udp] (LOG_ONCE) setsockopt called with unsupported level 0 and opt 49
00:00:04.834225 [126508:shadow-worker] 00:00:05.032603290 [WARN] [node6:29.251.164.100] [udp.rs:945] [shadow_rs::host::descriptor::socket::inet::udp] (LOG_ONCE) setsockopt SO_REUSEADDR not yet implemented for udp