Merge #10825: net: set regtest JSON-RPC port to 18443 to avoid conflict with testnet 18332

ce3baa193 changed regtest RPCport to 18443 to avoid conflict with testnet 18332 (Ferdinando M. Ametrano)

Pull request description:

  using the same JSON-RPC default port for both testnet and regtest prevents running both at the same time on the same machine. Since RPCport=P2Pport-1 for both mainnet and testnet, and regtest P2Pport being 18444, 18443 is proposed for regtest RPCport

  Documentation has been updated (or created where missing); manpages doc/man/bitcoin*.1 could include information for regtest too

Tree-SHA512: d42185f7ef54dc918ece19b543c8681d08bb9c5a971394e21f2d9a1091734b091b08df69fab622c207b46f402cf9323ded5b7a33fbd0af722388930169124e7f

src/chainparamsbase.cpp

@@ -57,7 +57,7 @@ class CBaseRegTestParams : public CBaseChainParams
 public:
     CBaseRegTestParams()
     {
-        nRPCPort = 18332;
+        nRPCPort = 18443;
         strDataDir = "regtest";
     }
 };