Add initial_reset option to reset rplidar on node start

[belovictor]

This pull request adds initial_reset option to launch file. When set to true (default is false which does not affect existing behaviour of rplidar node) RPLidar is being reset. This helps in case of problems with rplidar during robot operation - restarting the rplidar node will fix some of the rplidar problems by resetting it.

[deyouslamtec]

This PR has been merged.here