fix algo to determine --root for cpplint #46
Merged
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For a path
/somewhere/src/other/test/file.hpp
it picks/somewhere/src
as root without this patch.With this patch it uses the correct root for
rcl/test
which lead to a new style warning (http://ci.ros2.org/job/ci_linux/1022/) which is addressed by the referenced PR (http://ci.ros2.org/job/ci_linux/1023/).