Merge pull request #5136 from scientificlinux/sl7

Update sl container for sl7 to current (build-date=20181203)

library/sl

@@ -8,7 +8,7 @@ Tags: 7, latest
 Architectures: amd64
 GitFetch: refs/heads/7
 Directory: sl7
-GitCommit: 3d25951933c16ccfdccb4020122ec97fbef4d9c5
+GitCommit: f6204d7b37d1b9edd30539009aa2350a6e44c117
 
 # For the SL6 container
 Tags: 6