fix .gitattributes to always checkout shell scripts with LF endings
fix .gitattributes to always checkout shell scripts with LF endings

Always checkout sh files with LF to make sure a checkout on Windows does
not prevent to use scripts in Docker.

Change-Id: Ia1b95a7bf34b9259b7012094bf5af64023f87767

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr