Merge #19217: p2p: disambiguate block-relay-only variable names from blocksonly variables

ec4c6a1 scripted-diff: replace MAX_BLOCKS_ONLY_CONNECTIONS with MAX_BLOCK_RELAY_ONLY_CONNECTIONS (glowang)

Pull request description:

  We have two different concepts that have similar names: `-blocksonly` and `block-relay-only`, and the similarity of names could lead to confusion. `-blocksonly` disables all local receiving & relaying of transactions (with a few exceptions), while `block-relay-only`means that bitcoind will make 2 additional outbound connections that are only used for block relay.

  In net.h and init.cpp, `MAX_BLOCKS_ONLY_CONNECTIONS` is used to represent the maximum number of `block-relay-only` outbound peers, which is 2. But this name sounds ambiguous, and I proposed a better name,  `MAX_BLOCK_RELAY_ONLY_CONNECTION`.

ACKs for top commit:
  jnewbery:
    ACK ec4c6a1

Tree-SHA512: cfa592a7ff936f14d10cfc1e926a51b82bc0feaf104885a41ca8111b906cb3d1ec5536bab143a3cfca70aa49e9575c6995941eb6d3d7f4018d4535712342f155

Author: MarcoFalke

src/init.cpp

@@ -1888,7 +1888,7 @@ bool AppInitMain(const util::Ref& context, NodeContext& node)
     connOptions.nLocalServices = nLocalServices;
     connOptions.nMaxConnections = nMaxConnections;
     connOptions.m_max_outbound_full_relay = std::min(MAX_OUTBOUND_FULL_RELAY_CONNECTIONS, connOptions.nMaxConnections);
-    connOptions.m_max_outbound_block_relay = std::min(MAX_BLOCKS_ONLY_CONNECTIONS, connOptions.nMaxConnections-connOptions.m_max_outbound_full_relay);
+    connOptions.m_max_outbound_block_relay = std::min(MAX_BLOCK_RELAY_ONLY_CONNECTIONS, connOptions.nMaxConnections-connOptions.m_max_outbound_full_relay);
     connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS;
     connOptions.nMaxFeeler = MAX_FEELER_CONNECTIONS;
     connOptions.nBestHeight = chain_active_height;

src/net.h

@@ -61,7 +61,7 @@ static const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8;
 /** Maximum number of addnode outgoing nodes */
 static const int MAX_ADDNODE_CONNECTIONS = 8;
 /** Maximum number of block-relay-only outgoing connections */
-static const int MAX_BLOCKS_ONLY_CONNECTIONS = 2;
+static const int MAX_BLOCK_RELAY_ONLY_CONNECTIONS = 2;
 /** Maximum number of feeler connections */
 static const int MAX_FEELER_CONNECTIONS = 1;
 /** -listen default */