azure pipeline: try to add centos.  Third attempt.
@@ -17,7 +17,7 @@ jobs:
# imageName: 'ubuntu-16.04'
pool:
vmImage: $(imageName)
- container: $[ variables['containerImage'] ]
+ container: OpenLogic:CentOS:7.5:latest
steps:
- task: ShellScript@2
displayName: Install dependencies
