[wip/pmb2-robot] Release version 1.1.9

  * sonar related launch call moved to pmb2.launch for easier overload
 * Fixed error during ros_control starting on pmb2
 * Merging metal base branch
 * add pmb2_hardware.yaml !
 * speed_limit add padding and sonar
 * Update maintainer
 * Remove rgbd layer
 * Remove references to xtion
 * Contributors: Bence Magyar, Jeremie Deray, Luca Marchionni