[melodic][cob_pick_place_action] melodify cob_pick_place_action

[fmessmer]

Unfortunately, the tf2_ros changes broke something in the cob_pick_place_action....it makes move_group crash...thus, this should not be merged without further investigation/fixes...

Originally posted by @fmessmer in #138 (comment)

[fmessmer]

do it when tackling #125