[infer][PR] use apt addon in Travis
[infer][PR] use apt addon in Travis

Summary:
clean up dependencies by using apt addon rather than `sudo apt`. This should make it easier to re-add osx support later.
Pull Request resolved: https://github.com/facebook/infer/pull/1235

Differential Revision: D20368920

Pulled By: jvillard

fbshipit-source-id: 456e8af6c

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