Move docker files and update travis.yml accordingly

.travis.yml

@@ -7,15 +7,15 @@ env:
     - TESTER_IMAGE_NAME=atst-tester
     - PROD_IMAGE_NAME=atst-prod
 
-before_install:
+before_script:
   - docker login -u $ATAT_DOCKER_REGISTRY_USERNAME -p $ATAT_DOCKER_REGISTRY_PASSWORD $ATAT_DOCKER_REGISTRY_URL
-  - docker build --tag "${TESTER_IMAGE_NAME}" . -f docker/tester/Dockerfile
+  - docker build --tag "${TESTER_IMAGE_NAME}" . -f deploy/docker/tester/Dockerfile
 
 script:
   - docker run "${TESTER_IMAGE_NAME}"
 
 before_deploy:
-  - docker build --tag "${PROD_IMAGE_NAME}" . -f docker/prod/Dockerfile
+  - docker build --tag "${PROD_IMAGE_NAME}" . -f deploy/docker/prod/Dockerfile
   - git_sha="$(git rev-parse --short HEAD)"
   - remote_image_name="${ATAT_DOCKER_REGISTRY_URL}/${PROD_IMAGE_NAME}:${git_sha}"
   - docker tag "${PROD_IMAGE_NAME}" "${remote_image_name}"