Examples: fix certificate files for shadow build in sslechoserver

Change-Id: I2e5c35586c3cdc153abf9a70ee1ed6bba7894ecb
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

examples/websockets/sslechoserver/securesocketclient.qrc

+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>localhost.cert</file>
+    <file>localhost.key</file>
+</qresource>
+</RCC>

examples/websockets/sslechoserver/sslechoserver.cpp

@@ -50,8 +50,8 @@ SslEchoServer::SslEchoServer(quint16 port, QObject *parent) :
                                               QWebSocketServer::SecureMode,
                                               this);
     QSslConfiguration sslConfiguration;
-    QFile certFile(QStringLiteral("./localhost.cert"));
-    QFile keyFile(QStringLiteral("./localhost.key"));
+    QFile certFile(QStringLiteral(":/localhost.cert"));
+    QFile keyFile(QStringLiteral(":/localhost.key"));
     certFile.open(QIODevice::ReadOnly);
     keyFile.open(QIODevice::ReadOnly);
     QSslCertificate certificate(&certFile, QSsl::Pem);

examples/websockets/sslechoserver/sslechoserver.pro

@@ -15,3 +15,5 @@ HEADERS += \
     sslechoserver.h
 
 OTHER_FILES += sslechoclient.html
+
+RESOURCES += securesocketclient.qrc