Warning: TF_REPEATED_DATA ignoring data with redundant timestamp for frame odom_comb at time 23.567000 according to authority unknown_publisher

[Daviesss]

This pull request addresses issue https://github.com/ros-planning/navigation/issues/1125

I solved this problem by making a small tweak to the amcl_node.cpp file. In order to decrease the frequency of TF_REPEATED_DATA warnings, I lowered the publishing rate of the laser scan because amcl relies on the rate of incoming laser messages. I made this adjustment directly in the .cpp node, and it worked perfectly for me. As a result, the redundant messages no longer appear, which is fantastic.