install azure-devtools explicitly in setup ci machine (#1235)

.azure-pipelines/templates/setup-ci-machine.yml

@@ -9,3 +9,5 @@ steps:
   displayName: 'Install coverage'
 - script: pip install pytest-cov
   displayName: 'Install pytest-cov'
+- script: pip install azure-devtools
+  displayName: 'Install azure-devtools'