Powercycle script fails to complete in evergreen.yml

  "run powercycle test" :

    - command: shell.exec

      params:

        working_dir: src

        shell: bash

        script: |

          set -o verbose

          set -o errexit

...

          set +o errexit

          $python -u pytests/powertest.py --configFile=$config_file

          test_status=$?

          aws_ec2=$($python buildscripts/aws_ec2.py --imageId ${instance_id} --mode status)

          echo "Test completed, AMI EC2 instance ${instance_id} status: $aws_ec2"

          exit $test_status