[Backport 2.2-develop] Travis: surround variable TRAVIS_BRANCH with double-quotes instead of single-quotes #11704
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Related with PR #11667.
In dev/travis/before_script.sh, surround variable TRAVIS_BRANCH with double-quotes instead of single-quotes to get interpreted correctly:
![captura de pantalla 2017-10-24 a las 1 56 46](https://user-images.githubusercontent.com/17545750/31918751-a72f6d66-b85e-11e7-8945-955895fb8b6f.png)
This is a little demo of what Travis may be parsing:
![captura de pantalla 2017-10-24 a las 1 52 39](https://user-images.githubusercontent.com/17545750/31918788-cfc48b94-b85e-11e7-97ed-c218f9e0ca8a.png)
Description
This may affect the way static test are executed, or over which files are performed.
Fixed Issues (if relevant)
None AFAIK
Contribution checklist