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

This reverts commit 470dd82cfd5dd9199155e192047850b50fb61d80.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the gazebo_ros sub directory
Revert "Trimmed the branch to only the gazebo_ros sub directory"

This reverts commit 165fe353288469f5a5417bc4cb8d6bfc66a505c0.
Rebase from 'upstream'
Trimmed the branch to only the gazebo_ros sub directory