init: add exe name to bitcoind, bitcoin-node -version output to be able to distinguish these in tests

diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index ceb3c994..a4373daf 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -132,11 +132,16 @@ static bool ParseArgs(NodeContext& node, int argc, char* argv[])
     return true;
 }
 
-static bool ProcessInitCommands(ArgsManager& args)
+static bool ProcessInitCommands(interfaces::Init& init, ArgsManager& args)
 {
     // Process help and version before taking care about datadir
     if (HelpRequested(args) || args.GetBoolArg("-version", false)) {
-        std::string strUsage = CLIENT_NAME " daemon version " + FormatFullVersion() + "\n";
+        std::string strUsage = CLIENT_NAME " daemon version " + FormatFullVersion();
+        if (const char* exe_name{init.exeName()}) {
+            strUsage += " ";
+            strUsage += exe_name;
+        }
+        strUsage += "\n";
 
         if (args.GetBoolArg("-version", false)) {
             strUsage += FormatParagraph(LicenseInfo());
@@ -277,7 +282,7 @@ MAIN_FUNCTION
     ArgsManager& args = *Assert(node.args);
     if (!ParseArgs(node, argc, argv)) return EXIT_FAILURE;
     // Process early info return commands such as -help or -version
-    if (ProcessInitCommands(args)) return EXIT_SUCCESS;
+    if (ProcessInitCommands(*init, args)) return EXIT_SUCCESS;
 
     // Start application
     if (!AppInit(node) || !Assert(node.shutdown_signal)->wait()) {
diff --git a/src/init/bitcoin-gui.cpp b/src/init/bitcoin-gui.cpp
index eae30bc9..aca3fbe1 100644
--- a/src/init/bitcoin-gui.cpp
+++ b/src/init/bitcoin-gui.cpp
@@ -39,6 +39,7 @@ public:
     // bitcoin-node accepts the option, and bitcoin-gui accepts all bitcoin-node
     // options and will start the node with those options.
     bool canListenIpc() override { return true; }
+    const char* exeName() override { return EXE_NAME; }
     node::NodeContext m_node;
     std::unique_ptr<interfaces::Ipc> m_ipc;
 };
diff --git a/src/init/bitcoin-node.cpp b/src/init/bitcoin-node.cpp
index 3f8c50b8..e5f1411f 100644
--- a/src/init/bitcoin-node.cpp
+++ b/src/init/bitcoin-node.cpp
@@ -38,6 +38,7 @@ public:
     std::unique_ptr<interfaces::Echo> makeEcho() override { return interfaces::MakeEcho(); }
     interfaces::Ipc* ipc() override { return m_ipc.get(); }
     bool canListenIpc() override { return true; }
+    const char* exeName() override { return EXE_NAME; }
     node::NodeContext& m_node;
     std::unique_ptr<interfaces::Ipc> m_ipc;
 };
diff --git a/src/init/bitcoin-qt.cpp b/src/init/bitcoin-qt.cpp
index 5209c729..05f3bc32 100644
--- a/src/init/bitcoin-qt.cpp
+++ b/src/init/bitcoin-qt.cpp
@@ -16,6 +16,8 @@
 
 namespace init {
 namespace {
+const char* EXE_NAME = "bitcoin-qt";
+
 class BitcoinQtInit : public interfaces::Init
 {
 public:
@@ -32,6 +34,7 @@ public:
         return MakeWalletLoader(chain, *Assert(m_node.args));
     }
     std::unique_ptr<interfaces::Echo> makeEcho() override { return interfaces::MakeEcho(); }
+    const char* exeName() override { return EXE_NAME; }
     node::NodeContext m_node;
 };
 } // namespace
diff --git a/src/init/bitcoind.cpp b/src/init/bitcoind.cpp
index 48be8831..0b0ab3f8 100644
--- a/src/init/bitcoind.cpp
+++ b/src/init/bitcoind.cpp
@@ -18,6 +18,8 @@ using node::NodeContext;
 
 namespace init {
 namespace {
+const char* EXE_NAME = "bitcoind";
+
 class BitcoindInit : public interfaces::Init
 {
 public:
@@ -34,6 +36,7 @@ public:
         return MakeWalletLoader(chain, *Assert(m_node.args));
     }
     std::unique_ptr<interfaces::Echo> makeEcho() override { return interfaces::MakeEcho(); }
+    const char* exeName() override { return EXE_NAME; }
     NodeContext& m_node;
 };
 } // namespace
diff --git a/src/interfaces/init.h b/src/interfaces/init.h
index b496ada0..030ce306 100644
--- a/src/interfaces/init.h
+++ b/src/interfaces/init.h
@@ -38,6 +38,7 @@ public:
     virtual std::unique_ptr<Echo> makeEcho() { return nullptr; }
     virtual Ipc* ipc() { return nullptr; }
     virtual bool canListenIpc() { return false; }
+    virtual const char* exeName() { return nullptr; }
 };
 
 //! Return implementation of Init interface for the node process. If the argv