delete unused code

delete unused code

python/examples/pipeline/ocr/pipeline_http_client.py

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from paddle_serving_server.pipeline import PipelineClient
+# from paddle_serving_server.pipeline import PipelineClient
 import numpy as np
 import requests
 import json