[FLINK-7984][build] Bump snappy-java to 1.1.4

[yew1eb]

What is the purpose of the change

This PR bumps the snappy-java version to 1.1.4.
snappy-java-1.1.4 (2017-05-22):

• Fix a 1% performance regression when snappy is used in PIE executables.
• Improve compression performance by 5%.
• Improve decompression performance by 20%.
• See more: Snappy-java Release Notes

Verifying this change

This change should be covered by travis and the end-to-end tests.

[greghogan]

@yew1eb have you looked at FLINK-6965?

[yew1eb]

@greghogan, I saw the following in the flink-core POM:

<!-- We explicitly depend on snappy since connectors that require it load it through the system class loader -->
<dependency>
       <groupId>org.xerial.snappy</groupId>
       <artifactId>snappy-java</artifactId>
</dependency>

I think this PR just upgrades the snappy-java version from 1.1.1.3 to 1.1.4 for the "flink-core" module. I can not find out what bad effects it will cause.:)

[StephanEwen]

Bumping the version should be fine. We only need to make sure that wherever this is pulled, we promote it to a direct dependency such that dependency convergence works.

[StephanEwen]

Merging this...

[StephanEwen]

Sorry, actually, taking a step back: Can you check in which dependencies snappy is included in addition?
Especially big packaged dependencies like flink-s3-fs-presto and flink-s3-fs-hadoop? In case they contain snappy, we should manage the dependency to the same version there. If two different versions get pulled in, the update may not have an effect.

[zentol]

@yew1eb Could you close the PR? The issue was addressed in f1e4d25.