Node requesting blocks way ahead of forkdb head

[heifner]

requesting range 157319140 to 157322736, fhead 157238220, lib 157238217

Note that is some 80K blocks ahead.

Looks like this: #572 (comment) is unconstrained and allows net_plugin to keep requesting as the node catches up.

debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:1185           operator()           ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] handle notice_message
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:3625           handle_message       ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] this is a last irreversible notice with 157731556 pending blocks: 157731556 d247112a413f0ac3...
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:3645           handle_message       ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] this is a last irreversible notice with 157731556 blocks
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2437           sync_recv_notice     ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] sync_manager got last irreversible block notice
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2200           is_sync_required     ] last req = 157319139, last recv = 157319140 known = 157731554 our fhead = 157238220
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2132           request_next_chunk   ] sync_last_requested_num: 157319139, sync_next_expected_num: 157319140, sync_known_lib_num: 157731554, sync-fetch-span: 5000, fhead: 157238220, lib: 157238217
info  2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2137           request_next_chunk   ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] Catching up with chain, our last req is 157319139, theirs is 157731554, next expected 157319140, fhead 157238220
warn  2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2018           active_sync_fetch_sp ] sync-fetch-span 5000 restricted to 3597 by max-reversible-blocks, fork_db_size 3
info  2024-08-26T14:03:36.311 net-3     net_plugin.cpp:2177           operator()           ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] requesting range 157319140 to 157322736, fhead 157238220, lib 157238217
debug 2024-08-26T14:03:36.311 net-3     net_plugin.cpp:1960           request_sync_blocks  ] ["89.38.98.37:9876 - cbb90ba" - 1 89.38.98.37:9876] calling sync_wait, sync_request_message 157319140 - 157322736