Virtualenv issue. (Azure#12200)

* Virtualenv issue.

Author: mitchdenny

eng/ci_tools.txt

@@ -1,7 +1,8 @@
 # requirements leveraged by ci tools
 setuptools==44.1.0; python_version == '2.7'
 setuptools==45.1.0; python_version >= '3.5'
-wheel==0.34.2 
+virtualenv==20.0.23
+wheel==0.34.2
 Jinja2==2.11.1
 packaging==20.4
 tox==3.14.6

eng/pipelines/templates/steps/build-test.yml

@@ -28,7 +28,7 @@ steps:
       OSName: ${{ parameters.OSName }}
 
   - script: |
-      python -m pip install pip == 20.1
+      python -m pip install pip==20.1
       pip install -r eng/ci_tools.txt
       pip --version
     displayName: 'Prep Environment'

eng/pipelines/templates/steps/run_pylint.yml

@@ -13,6 +13,7 @@ steps:
 
 
   - script: |
+      python -m pip install pip==20.1
       pip install -r eng/ci_tools.txt
     displayName: 'Prep Environment'
     condition: succeededOrFailed()