Fix few issues according to fedora packaging guidelines
    
    * Package does not run rm -rf %{buildroot} (or $RPM_BUILD_ROOT) at the
         beginning of %install.
    * Buildroot is not present
         Note: Buildroot: present but not needed
    * Package has no %clean section with rm -rf %{buildroot} (or
                 $RPM_BUILD_ROOT)
         Note: %clean present but not required