Mercurial: Handle HTTP authentication

Make it possible to pull and push onto online repositories with http
authorization.

Task-number: QTCREATORBUG-5104

Change-Id: Id5f5a865d301e644002e4fa8b7056d08fd9b7467
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/mercurial/srcdestdialog.h

@@ -49,6 +49,9 @@ public:
     void setPathChooserKind(Utils::PathChooser::Kind kind);
     QString getRepositoryString() const;
 
+private:
+    QUrl getRepoUrl() const;
+
 private:
     Ui::SrcDestDialog *m_ui;
 };