Merge pull request #3999 from ros-infrastructure/gazebo

[Gazebo] version bump for v7

library/gazebo

@@ -60,12 +60,12 @@ Directory: gazebo/6/ubuntu/trusty/libgazebo6
 
 Tags: gzserver7, gzserver7-xenial
 Architectures: amd64
-GitCommit: b593ba3dafc4ab63b424bd2dc39d0f4e6710ea6e
+GitCommit: 7fb57055bd2c50ef60cc657911c55b43808bb478
 Directory: gazebo/7/ubuntu/xenial/gzserver7
 
 Tags: libgazebo7, libgazebo7-xenial
 Architectures: amd64
-GitCommit: b593ba3dafc4ab63b424bd2dc39d0f4e6710ea6e
+GitCommit: 7fb57055bd2c50ef60cc657911c55b43808bb478
 Directory: gazebo/7/ubuntu/xenial/libgazebo7