Update sl container for sl6 to current (build-date=20180403)
@@ -15,4 +15,4 @@ Tags: 6
Architectures: amd64
GitFetch: refs/heads/6
Directory: sl6
-GitCommit: 2bf200b86a0d533576a1a49c93e50f4e65a5bc12
+GitCommit: b561b3b2418f10518e47ee7defa43284e154e193
yosifkit