message: [cluster-test] ct: use master image by default
  Most of people don't want to build cluster test, only use it, so for them best option is to use latest master image
  Added `-L` flag to use latest image built on host
  Closes:
  Approved by: ankushagarwal
diff: # SPDX-License-Identifier: Apache-2.0
  set -e
  -DOCKER_IMAGE="cluster-test:latest"
  +DOCKER_IMAGE=""
  WAIT_TO="45m"
  export CONTAINER="cluster-test-$RANDOM"
  @@ -27,6 +27,10 @@ while (( "$#" )); do
  WAIT_TO=$2
  shift 2
  ;;
  + -L|--latest)
  + DOCKER_IMAGE="cluster-test:latest"
  + shift 1
  + ;;
  --) # end argument parsing
  shift
  break
  @@ -37,6 +41,14 @@ while (( "$#" )); do
  esac
  done
  +if [ -z "$DOCKER_IMAGE" ]
  +then
  + echo "Using master cluster test image"
  + $(aws ecr get-login --no-include-email --region us-west-2)
  + DOCKER_IMAGE="853397791086.dkr.ecr.us-west-2.amazonaws.com/libra_cluster_test:master"
  + docker pull $DOCKER_IMAGE
  +fi
  +
  # Waiting for other runs to finish
  timeout $WAIT_TO bash -c 'while [ $(docker ps --quiet --filter name=$CONTAINER) ]; do echo "Another container is running, waiting..."; sleep 1m; done'
  