Fix runtime coverage save (use /tmp for write permissions)

Author: ambrussimon

api/web/start.py

@@ -8,7 +8,7 @@
 #   http://coverage.readthedocs.io/en/coverage-4.2/faq.html
 if os.environ.get("SCITRAN_RUNTIME_COVERAGE") == "true": # pragma: no cover - oh, the irony
     import coverage
-    cov = coverage.coverage(source=["api"], data_suffix="integration-tests")
+    cov = coverage.coverage(source=["api"], data_file="/tmp/.coverage.integration-tests")
 
     class CoverageSaveHandler(webapp2.RequestHandler):
         def save_coverage(self):

tests/bin/docker-tests.sh

@@ -106,7 +106,7 @@ clean_up() {
 
         # Save integration test coverage
         docker exec core-test-service python -c 'import requests; requests.post("http://localhost/api/save-coverage")'
-        docker cp core-test-service:/src/core/.coverage.integration-tests ./ 2>/dev/null
+        docker cp core-test-service:/tmp/.coverage.integration-tests ./ 2>/dev/null
 
         # Combine unit/integ coverage and report/grenerate html
         docker run --rm \