[SPARK-20603][SS][TEST] Set default number of topic partitions to 1 to reduce the load

## What changes were proposed in this pull request?

I checked the logs of https://amplab.cs.berkeley.edu/jenkins/job/spark-branch-2.2-test-maven-hadoop-2.7/47/ and found it took several seconds to create Kafka internal topic `__consumer_offsets`. As Kafka creates this topic lazily, the topic creation happens in the first test `deserialization of initial offset with Spark 2.1.0` and causes it timeout.

This PR changes `offsets.topic.num.partitions` from the default value 50 to 1 to make creating `__consumer_offsets` (50 partitions -> 1 partition) much faster.

## How was this patch tested?

Jenkins

Author: Shixiong Zhu <shixiong@databricks.com>

Closes #17863 from zsxwing/fix-kafka-flaky-test.

external/kafka-0-10-sql/src/test/scala/org/apache/spark/sql/kafka010/KafkaTestUtils.scala

@@ -292,6 +292,7 @@ class KafkaTestUtils(withBrokerProps: Map[String, Object] = Map.empty) extends L
     props.put("log.flush.interval.messages", "1")
     props.put("replica.socket.timeout.ms", "1500")
     props.put("delete.topic.enable", "true")
+    props.put("offsets.topic.num.partitions", "1")
     props.putAll(withBrokerProps.asJava)
     props
   }