Add Roberts computer

host_vars/las115.las.kit.edu

+ansible_user: gethmann
+user_account: rossmanith
+ip_suffix: 115
+loc: 619
+os: Fedora 25

hosts

 # stable
 [clients]
 las113.las.kit.edu
+las115.las.kit.edu
 las116.las.kit.edu
 las118.las.kit.edu
 las120.las.kit.edu
@@ -10,6 +11,7 @@ las-gethmann.las.kit.edu
 
 [desktop]
 las113.las.kit.edu
+las115.las.kit.edu
 las116.las.kit.edu
 las118.las.kit.edu
 las120.las.kit.edu