[FLINK-18749][k8s] Correct dependencies in Kubernetes pom

[wangyang0918]

What is the purpose of the change

Inspired when developing this 8519f65, i find some unused dependency(e.g. com.github.mifmif:generex:1.0.2) in flink-kubernetes/pom.xml. It will be good if could remove it.

Brief change log

• Delete unused dependency and relocation com.mifmif

Verifying this change

All the current tests should pass.

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

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

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Automated Checks

Last check on commit d1596d1 (Tue Aug 04 11:12:29 UTC 2020)

Warnings:

• 1 pom.xml files were touched: Check for build and licensing issues.
• No documentation files were touched! Remember to keep the Flink docs up to date!

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[tillrohrmann]

Thanks for creating this PR @wangyang0918. LGTM. +1 for merging once AZP gives green light.