ui: Replace some LogPrintfs with qDebug()

These are relatively unimportant messages, so don't need to be logged
without -debug=ui.

src/qt/bitcoin.cpp

@@ -34,6 +34,7 @@
 
 #include <boost/filesystem/operations.hpp>
 #include <QApplication>
+#include <QDebug>
 #include <QLibraryInfo>
 #include <QLocale>
 #include <QMessageBox>
@@ -237,7 +238,7 @@ void BitcoinCore::initialize()
 {
     try
     {
-        LogPrintf("Running AppInit2 in thread\n");
+        qDebug() << __func__ << ": Running AppInit2 in thread";
         int rv = AppInit2(threadGroup);
         if(rv)
         {
@@ -258,11 +259,11 @@ void BitcoinCore::shutdown()
 {
     try
     {
-        LogPrintf("Running Shutdown in thread\n");
+        qDebug() << __func__ << ": Running Shutdown in thread";
         threadGroup.interrupt_all();
         threadGroup.join_all();
         Shutdown();
-        LogPrintf("Shutdown finished\n");
+        qDebug() << __func__ << ": Shutdown finished";
         emit shutdownResult(1);
     } catch (std::exception& e) {
         handleRunawayException(&e);
@@ -290,10 +291,10 @@ BitcoinApplication::BitcoinApplication(int &argc, char **argv):
 
 BitcoinApplication::~BitcoinApplication()
 {
-    LogPrintf("Stopping thread\n");
+    qDebug() << __func__ << ": Stopping thread";
     emit stopThread();
     coreThread->wait();
-    LogPrintf("Stopped thread\n");
+    qDebug() << __func__ << ": Stopped thread";
 
     delete window;
     window = 0;
@@ -355,13 +356,13 @@ void BitcoinApplication::startThread()
 
 void BitcoinApplication::requestInitialize()
 {
-    LogPrintf("Requesting initialize\n");
+    qDebug() << __func__ << ": Requesting initialize";
     emit requestedInitialize();
 }
 
 void BitcoinApplication::requestShutdown()
 {
-    LogPrintf("Requesting shutdown\n");
+    qDebug() << __func__ << ": Requesting shutdown";
     window->hide();
     window->setClientModel(0);
     pollShutdownTimer->stop();
@@ -383,7 +384,7 @@ void BitcoinApplication::requestShutdown()
 
 void BitcoinApplication::initializeResult(int retval)
 {
-    LogPrintf("Initialization result: %i\n", retval);
+    qDebug() << __func__ << ": Initialization result: " << retval;
     // Set exit result: 0 if successful, 1 if failure
     returnValue = retval ? 0 : 1;
     if(retval)
@@ -438,7 +439,7 @@ void BitcoinApplication::initializeResult(int retval)
 
 void BitcoinApplication::shutdownResult(int retval)
 {
-    LogPrintf("Shutdown result: %i\n", retval);
+    qDebug() << __func__ << ": Shutdown result: " << retval;
     quit(); // Exit main loop after shutdown finished
 }