def database_names(filter = {}, opts = {})
      list_databases(filter, true, opts).collect{ |info| info[Database::NAME] }
    end
def database_names(filter = {}, opts = {})
      list_databases(filter, true, opts).collect{ |info| info[Database::NAME] }
    end
Get the names of all databases.

 @example Get the database names.
   client.database_names

 @param [ Hash ] filter The filter criteria for getting a list of databases.
 @param [ Hash ] opts The command options.

 @return [ Array<String> ] The names of the databases.

 @since 2.0.5