Changed base image from ubuntu:16.04 to ubuntu:18.04.

library/sapmachine

@@ -3,5 +3,5 @@ GitRepo: https://github.com/SAP/SapMachine-infrastructure.git
 
 Tags: 11, latest
 Architectures: amd64
-GitCommit: 6a64492e6cfab504ac4944a681262968498b6658
+GitCommit: cfeb4c0d661b0cbf457adf5ef1bd3a7fa631969b
 Directory: dockerfiles/official/11