fix_MultiLangServer_bug and encryption doc

Compatible with Python 3 syntax

fix Codestyle

Merge pull request #995 from HexToString/encryption_branch

use paddle 2.0.0 fix encryption and some doc

cherry pick 2 PR

Dockerfile update

Fix some doc

V0.4.1 cherry pick 4 merges

Fit a line - Auto shape

fix java doc and java client ip(default 127.0.0.1)-ysl

fix encryption get_data.sh bug

fix bert_web_service_gpu and fix doc

增加安装问题解答

cherry pick PR979 976

cherry-pick 971 970 967

Auto shape for Web Service

support cuda10.1 10.2 TensorRT and fix some bug

fix java client bug

Merge pull request #969 from TeslaZhao/develop

support multiple devices(cpu/gpu/trt/xpu/arm) in pipeline mode

fix python bug and add java example

[WIP]support arm and xpu

Update channel_acc_size

fix compile doc for trt

fix param name