Warning of building was resolved

[daradurvs]

Hi Igniters,

There was warning of building of the core module[1].

The reason was guava-dependency duplication in pom.xml

I removed outdated dependency and warning was gone.

I checked compilation with clean local repo, it passed well.

My fix was merged to the master branch, thanks to Anton Vinogradov .

[1] https://issues.apache.org/jira/browse/IGNITE-5882

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Best Regards, Vyacheslav D.