Add src/node/* code to node:: namespace

src/interfaces/node.h

@@ -32,8 +32,10 @@ class proxyType;
 enum class SynchronizationState;
 enum class TransactionError;
 struct CNodeStateStats;
-struct NodeContext;
 struct bilingual_str;
+namespace node {
+struct NodeContext;
+} // namespace node
 
 namespace interfaces {
 class Handler;
@@ -242,12 +244,12 @@ public:
 
     //! Get and set internal node context. Useful for testing, but not
     //! accessible across processes.
-    virtual NodeContext* context() { return nullptr; }
-    virtual void setContext(NodeContext* context) { }
+    virtual node::NodeContext* context() { return nullptr; }
+    virtual void setContext(node::NodeContext* context) { }
 };
 
 //! Return implementation of Node interface.
-std::unique_ptr<Node> MakeNode(NodeContext& context);
+std::unique_ptr<Node> MakeNode(node::NodeContext& context);
 
 //! Block tip (could be a header or not, depends on the subscribed signal).
 struct BlockTip {