Merge branch 'add_extra_joints' into 'foxy-devel'

Add extra joints

See merge request robots/pmb2_robot!74

Author: victor

pmb2_controller_configuration/config/joint_state_broadcaster.yaml

@@ -3,5 +3,4 @@
     type: joint_state_broadcaster/JointStateBroadcaster
     use_sim_time: True
     publish_rate: 50.0
-
-
+    extra_joints: ['caster_back_left_1_joint', 'caster_back_left_2_joint', 'caster_front_left_1_joint', 'caster_front_left_2_joint', 'caster_back_right_1_joint', 'caster_back_right_2_joint', 'caster_front_right_1_joint', 'caster_front_right_2_joint', 'suspension_left_joint', 'suspension_right_joint']