def tearDown(self):
        super(SimpleInstanceTest, self).tearDown()
        CONF.network_label_regex = self.orig_conf
        CONF.ip_start = None
def create_texture():
  global rgbtex
  rgbtex = glGenTextures(1)
  glBindTexture(TEXTURE_TARGET, rgbtex)
  glTexImage2D(TEXTURE_TARGET,0,GL_RGB,640,480,0,GL_RGB,GL_UNSIGNED_BYTE,None)