Revert "Trimmed the branch to only the gazebo_ros_pkgs sub directory"

This reverts commit c3e1b9f3f9633329f3cfdbda7653c89b2f9eace0.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the gazebo_ros_pkgs sub directory
Revert "Trimmed the branch to only the gazebo_ros_pkgs sub directory"

This reverts commit 24459ebdf0c89b8461643f4c348938d71588257f.
Rebase from 'upstream'
Trimmed the branch to only the gazebo_ros_pkgs sub directory