Passed in wrong arguments for new getConnector helper method.

[EricWohlstadter]

Order should be (userProvidedDriverClass, url, userName, dbcp2Configs)

What changes were proposed in this pull request?

Fix getConnector helper method which derives arguments from HWConf class.

How was this patch tested?

Uncommitted integration test:

val hive = com.hortonworks.spark.sql.hive.llap.HiveWarehouseBuilder.session(spark).build()
hive.setDatabase("tpcds_bin_partitioned_orc_1000")
val df = hive.executeQuery("select * from web_sales")
hive.setDatabase("spark_llap")
val tempTable = "t_" + System.currentTimeMillis()
hive.createTable(tempTable).ifNotExists().column("ws_sold_time_sk", "bigint").column("ws_ship_date_sk", "bigint").create()
df.select("ws_sold_time_sk", "ws_ship_date_sk").filter("ws_sold_time_sk > 80000").write.format("com.hortonworks.spark.sql.hive.llap.HiveWarehouseConnector").option("table", tempTable).save()
val df2 = hive.executeQuery("select * from " + tempTable)
df2.show(20)
hive.dropTable(tempTable, true, false)

[EricWohlstadter]

+1 from @jdere offline