[FLINK-17134] correct logs information in KafkaPartitionDiscoverer

[Jiayi-Liao]

What is the purpose of the change

The logging information is not right before because wrong usage of String.format(xx,xx...)

Brief change log

Trival fix. Replace "Could not fetch partitions for %s. Make sure that the topic exists.".format(topic) with String.format("Could not fetch partitions for %s. Make sure that the topic exists.", topic).

Verifying this change

There's no need.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit dda525d (Tue Apr 14 10:16:56 UTC 2020)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!
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[aljoscha]

Thanks for the quick fix!