rpc: fix -rpcclienttimeout 0 option
cf81f8136e18
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Description

rpc: fix -rpcclienttimeout 0 option

Summary:
When -rpcclienttimeout=0 was provided, the default libevent timeout of 50 s was used, instead of no timeout as documented.
This change fixes it by setting timeout to 5 years when 0 is passed to -rpcclienttimeout.

This is a backport of Core PR17131

Test Plan:

$ src/bitcoin-cli -rpcclienttimeout=10 gettxoutsetinfo
error: Could not connect to the server 127.0.0.1:8332 (error code 0 - "timeout reached")
$ time src/bitcoin-cli -rpcclienttimeout=0 gettxoutsetinfo
{
  "height": 658626,
  "bestblock": "000000000000000002050eb8ee46cdb7d56cbc816ca13e3de000bee82bde9d34",
  "transactions": 17556030,
  "txouts": 37933218,
  "bogosize": 2871043050,
  "hash_serialized": "4790608c2e6ef02606f38680d5716b632e6cb006284c7f36c269d73be038496c",
  "disk_size": 2156465916,
  "total_amount": 18553754.67451907
}

real	1m52,365s
user	0m0,006s
sys	0m0,001s