Some issues with deepstream-pravega

[vangork]

1. The following error is met when executing gstreamer-pravega/deepstream/docker-run.sh

luis@luis-precision:~/projects/gstreamer-pravega/deepstream$ ./docker-run.sh 
+++ dirname ./docker-run.sh
++ readlink -f ./..
+ ROOT_DIR=/home/luis/projects/gstreamer-pravega
+ xhost +
access control disabled, clients can connect from any host
+ docker run -it --rm --gpus all --network host --privileged --log-driver json-file --log-opt max-size=10m --log-opt max-file=2 -v /home/luis/projects/gstreamer-pravega:/root/work/gstreamer-pravega -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/log:/dev/log -e DISPLAY=:1 -e CUDA_VER=11.1 -w /root/work/gstreamer-pravega pravega/deepstream:latest
/entrypoint.sh: line 15: ENTRYPOINT: Required environment variable not set

2. --conn-str in
   https://github.com/pravega/gstreamer-pravega/blob/master/deepstream/README.md?plain=1#L53 and https://github.com/pravega/gstreamer-pravega/blob/master/deepstream/README.md?plain=1#L53
   need to be updated. routing_key is set in the config file instead of from the uri path right now.