New CI pipeline to test autorest.python for azure-core

eng/pipelines/autorest_checks.yml

@@ -0,0 +1,47 @@
+pr:
+  branches:
+    include:
+    - master
+    - feature/*
+    - hotfix/*
+    - release/*
+    - restapi*
+  paths:
+    include:
+    - sdk/core/
+
+variables:
+  NodeVersion: '10.x'
+  PythonVersion: '3.6'
+  auto_rest_clone_url: 'https://github.com/Azure/autorest.python.git'
+  repo_branch: 'azure-core'
+  source_path: 'sdk/core/azure-core'
+
+jobs:
+  - job: 'Run_AutoRest'
+    displayName: 'Run AutoRest'
+
+    pool:
+      vmImage: 'ubuntu-16.04'
+
+    steps:
+      - task: NodeTool@0
+        displayName: 'Install Node.js $(NodeVersion)'
+        inputs:
+          versionSpec: '$(NodeVersion)'        
+
+      - task: UsePythonVersion@0
+        displayName: 'Use Python $(PythonVersion)'
+        inputs:
+          versionSpec: $(PythonVersion)
+
+      - script: pip install pytest pytest-cov pytest-asyncio isodate msrest aiohttp $(Build.SourcesDirectory)/$(source_path)
+        displayName: 'Prepare Environment'
+
+      - script: |
+          git clone --recursive $(auto_rest_clone_url)
+          cd autorest.python
+          git checkout $(repo_branch)
+          npm install
+          pytest test/vanilla
+        displayName: 'Run Test'