/usr/lib/ruby/vendor_ruby/ is in ruby-openstack 2.0.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/openstack/
/usr/lib/ruby/vendor_ruby/openstack/compute/
/usr/lib/ruby/vendor_ruby/openstack/compute/address.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/flavor.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/image.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/metadata.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/personalities.rb
/usr/lib/ruby/vendor_ruby/openstack/compute/server.rb
/usr/lib/ruby/vendor_ruby/openstack/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/core_ext/
/usr/lib/ruby/vendor_ruby/openstack/core_ext/to_query.rb
/usr/lib/ruby/vendor_ruby/openstack/identity/
/usr/lib/ruby/vendor_ruby/openstack/identity/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/identity/tenant.rb
/usr/lib/ruby/vendor_ruby/openstack/identity/user.rb
/usr/lib/ruby/vendor_ruby/openstack/image/
/usr/lib/ruby/vendor_ruby/openstack/image/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/network/
/usr/lib/ruby/vendor_ruby/openstack/network/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/network/network.rb
/usr/lib/ruby/vendor_ruby/openstack/network/port.rb
/usr/lib/ruby/vendor_ruby/openstack/network/router.rb
/usr/lib/ruby/vendor_ruby/openstack/network/subnet.rb
/usr/lib/ruby/vendor_ruby/openstack/swift/
/usr/lib/ruby/vendor_ruby/openstack/swift/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/swift/container.rb
/usr/lib/ruby/vendor_ruby/openstack/swift/storage_object.rb
/usr/lib/ruby/vendor_ruby/openstack/volume/
/usr/lib/ruby/vendor_ruby/openstack/volume/connection.rb
/usr/lib/ruby/vendor_ruby/openstack/volume/snapshot.rb
/usr/lib/ruby/vendor_ruby/openstack/volume/volume.rb
/usr/lib/ruby/vendor_ruby/openstack.rb