[2617] log lname after establishing cc session; for debug aid

src/lib/cc/cc_messages.mes

@@ -60,6 +60,10 @@ and its length (2 bytes) is counted in the total length.
 There should be data representing the length of message on the socket, but it
 is not there.
 
+% CC_LNAME_RECEIVED received local name: %1
+Debug message: the local module received its unique identifier (name)
+from msgq on completion of establishing the session with msgq.
+
 % CC_NO_MESSAGE no message ready to be received yet
 The program polled for incoming messages, but there was no message waiting.
 This is a debug message which may happen only after CC_GROUP_RECEIVE.

src/lib/cc/session.cc

@@ -333,6 +333,7 @@ Session::establish(const char* socket_file) {
     recvmsg(routing, msg, false);
 
     impl_->lname_ = msg->get("lname")->stringValue();
+    LOG_DEBUG(logger, DBG_TRACE_DETAILED, CC_LNAME_RECEIVED).arg(impl_->lname_);
 
     // At this point there's no risk of resource leak.
     session_holder.clear();