Handle missing config better in http_api_nostream.
Better log warning for bad http_api_nostream config.
Merge branch 'feature/issue-814-handle-missing-http-api-nostream-configs' into develop
Merge branch 'develop' into feature/issue-786-test-helpers-vumitools
Merge branch 'feature/issue-786-test-helpers-vumitools' into feature/adhoc-amqp-test-helper

Conflicts:
	go/apps/http_api_nostream/tests/test_vumi_app.py