XD 1431 Support multiple admin servers on same host

- Add Standalone HSQLDB server application
- Have HsqlServerApplication as boot SpringApplication which loads hsql datasource and 
    during its context lifecycle
- Make SingleNode server start/stop HSQLServerBean during its lifecycle
- AdminServer and Container wouldn't start the HSQLServerBean (if hsqldb is choosen as ba
   - Add BatchDatasourceVerificationListener to AdminServer that checks if at least one of
- Remove jdbc.properties as it is not being used
- Fix tests
- Add hsqldb-server scripts and make them available inside $XD_HOME/bin/
- Make HSQLServerBean available only in singlenode and standalone hsqldb
- Fix profile name for singlenode