Query with different time format does not work if database is not specified.

If you do not specify database in query (even thou you have specified database on the client level) method InfluxDBl#query(Query, TimeUnit) will not return any result because it will not send database information.

Steps to reproduce:

```java
InfluxDB influxDB = InfluxDBFactory.connect(host + ":" + port);
influxDB.setDatabase(database);
// queryResult will be empty.
QueryResult queryResult = influxDB.query(new Query("..."), TimeUnit.NANOSECONDS)
```

Quick fix:
```java
InfluxDB influxDB = InfluxDBFactory.connect(host + ":" + port);
influxDB.setDatabase(database);
// queryResult will be empty.
QueryResult queryResult = influxDB.query(new Query("...", "database"), TimeUnit.NANOSECONDS)
```

Permanent fix:
Change into "InfluxDBImpl#query(Query, TimeUnit)" into:
```java
public QueryResult query(final Query query, final TimeUnit timeUnit) {
String db = query.getDatabase();
if (db == null) {
db = this.database;
}
Call call = null;
if (query instanceof BoundParameterQuery) {
BoundParameterQuery boundParameterQuery = (BoundParameterQuery) query;
call = this.influxDBService.query(db,
TimeUtil.toTimePrecision(timeUnit), query.getCommandWithUrlEncoded(),
boundParameterQuery.getParameterJsonWithUrlEncoded());
} else {
call = this.influxDBService.query(db,
TimeUtil.toTimePrecision(timeUnit), query.getCommandWithUrlEncoded());
}
return executeQuery(call);
}
```
Here database information is taken from client level if not given in query object.

Inizia da InfluxDBImpl#query(Query, TimeUnit) e verifica come Query.getDatabase() e il database configurato a livello client vengono passati a influxDBService.query. Verifica il comportamento sia di Query normale sia di BoundParameterQuery. Il lavoro è completato quando una query senza un proprio database utilizza il database configurato sul client e restituisce i risultati con la precisione temporale richiesta.

Scritto dal modello di indicizzazione a partire dal testo della issue.