change: set integration test parallelization to 512 (#1169)

Author: knakad

buildspec.yml

@@ -20,7 +20,7 @@ phases:
       - start_time=`date +%s`
       - |
         if has-matching-changes "tests/" "src/*.py" "setup.py" "setup.cfg" "buildspec.yml"; then
-          tox -e py36 -- tests/integ -m "not local_mode" -n 48  --reruns 3 --reruns-delay 5 --durations 50 --boto-config '{"region_name": "us-east-2"}'
+          tox -e py36 -- tests/integ -m "not local_mode" -n 512 --reruns 3 --reruns-delay 5 --durations 50 --boto-config '{"region_name": "us-east-2"}'
         fi
       - ./ci-scripts/displaytime.sh 'py36 tests/integ' $start_time