Fix Database Service install guide

Reasons:
 - current guide misses:
   - few configuration steps for Juno release;
   - package install must explicitly reflect
     trove-conductor package installation;
   - api-paste.ini configuration tips;
   - trove-guestagent.conf configuration tips;
   - explicit trove-manage CLI Datastore/Version capabilities;
   - explicit service loggining configuration;

Change-Id: I6a60933c1acbbd83e337518448e5a1775c4ab6c9
Merge "Fix Database Service install guide"