Slience output from curl for integration tests

We use curl in our integration test script to make sure the application container is
available before moving on. We expect many connection errors and don't care
about the output of curl, so this will just swallow all of the output.

script/integration_tests

@@ -72,15 +72,18 @@ $CONTAINER_IMAGE \
 
 # Use curl to wait for application container to become available
 docker pull curlimages/curl:latest
+echo "Waiting for application container to become available"
 docker run --network atat \
   curlimages/curl:latest \
-  curl --connect-timeout 3 \
+  curl \
+  --silent \
+  --connect-timeout 3 \
   --max-time 5 \
   --retry $CONTAINER_TIMEOUT \
   --retry-connrefused \
   --retry-delay 1 \
   --retry-max-time $CONTAINER_TIMEOUT \
-  test-atat:8000
+  test-atat:8000 >/dev/null
 
 # Run Ghost Inspector tests
 docker pull ghostinspector/test-runner-standalone:latest