Merge #20606: Remove unused bits from service flags enum

fa40168 Remove unused bits from service flags enum (MarcoFalke)

Pull request description:

  Remove service bits that haven't been observed on the active network for years and won't ever be observed on the network with this meaning. Keeping this dead assignment in our source code forever doesn't add any value.

  I somehow forgot to do this in commit fa0d0ff.

ACKs for top commit:
  laanwj:
    Code review ACK fa40168
  practicalswift:
    cr ACK fa40168
  fanquake:
    ACK fa40168

Tree-SHA512: 376e5ac05940493cf2209fea60515c843e978c4b476f2524f6bf7a37a646d237c3ddcf6c0fa23641f9ba550f625609703d9b51b4be631a7f2a90e1092b557232

Author: laanwj

src/protocol.cpp

@@ -203,7 +203,6 @@ static std::string serviceFlagToStr(size_t bit)
     switch ((ServiceFlags)service_flag) {
     case NODE_NONE: abort();  // impossible
     case NODE_NETWORK:         return "NETWORK";
-    case NODE_GETUTXO:         return "GETUTXO";
     case NODE_BLOOM:           return "BLOOM";
     case NODE_WITNESS:         return "WITNESS";
     case NODE_COMPACT_FILTERS: return "COMPACT_FILTERS";

src/protocol.h

@@ -273,10 +273,6 @@ enum ServiceFlags : uint64_t {
     // NODE_NETWORK means that the node is capable of serving the complete block chain. It is currently
     // set by all Bitcoin Core non pruned nodes, and is unset by SPV clients or other light clients.
     NODE_NETWORK = (1 << 0),
-    // NODE_GETUTXO means the node is capable of responding to the getutxo protocol request.
-    // Bitcoin Core does not support this but a patch set called Bitcoin XT does.
-    // See BIP 64 for details on how this is implemented.
-    NODE_GETUTXO = (1 << 1),
     // NODE_BLOOM means the node is capable and willing to handle bloom-filtered connections.
     // Bitcoin Core nodes used to support this by default, without advertising this bit,
     // but no longer do as of protocol version 70011 (= NO_BLOOM_VERSION)

test/functional/test_framework/messages.py

@@ -51,7 +51,6 @@
 MAX_INV_SIZE = 50000  # Maximum number of entries in an 'inv' protocol message
 
 NODE_NETWORK = (1 << 0)
-NODE_GETUTXO = (1 << 1)
 NODE_BLOOM = (1 << 2)
 NODE_WITNESS = (1 << 3)
 NODE_COMPACT_FILTERS = (1 << 6)