Make description non-required, ignore jetty.ssl.port when jetty.use.ssl=false, add version property to database.properties

3 minor changes:
- make "Description" non-required when creating a report
- have the ExecutorMailer ignore the jetty.ssl.port property and use the jetty.port property instead when jetty.use.ssl=false
- added "version=" to the database.properties file so that AzkabanDatabaseSetup does not complain