Fix linter failures in nav2_util

Test project /home/crdelsey/src/ros_dev_workspace/navigation2/build/nav2_util
Start 1: copyright
1/5 Test #1: copyright ........................***Failed 0.46 sec
Start 2: cppcheck
2/5 Test #2: cppcheck .........................***Failed 0.53 sec
Start 3: cpplint
3/5 Test #3: cpplint ..........................***Failed 1.15 sec
Start 4: lint_cmake
4/5 Test #4: lint_cmake ....................... Passed 0.46 sec
Start 5: uncrustify
5/5 Test #5: uncrustify .......................***Failed 1.06 sec

[mkhansenbot]

@crdelsey - how do we reproduce these?

@mkhansen-intel The easiest way to reproduce is to run colcon test. However, that won't show the specific failures. To see the details, what I do is

cd build\nav2_util
ctest -V