Add syslog drain service to preview and staging

This should and will be moved back to the approriate manifest-base-*.yml
files when it is configured for production usage.

manifest-api-staging.yml

@@ -2,6 +2,17 @@
 
 inherit: manifest-api-base.yml
 
+services:
+  - notify-aws
+  - notify-config
+  - notify-db
+  - mmg
+  - firetext
+  - hosted-graphite
+  - redis
+  - performance-platform
+  - logit-ssl-syslog-drain
+
 routes:
   - route: notify-api-staging.cloudapps.digital
   - route: api.staging-notify.works