job name and pip fixes

.yamato/standalone-build-test.yml

 ---
 {% for config in test_configs %}
 test_standalone_{{ config.name }}:
-  name: Test Mac Standalone {{ config.version }}
+  name: Test {{ config.name }} Standalone
   agent:
     type: {{ config.type }}
     image: {{ config.image }}

.yamato/training-int-tests.yml

   commands:
     - pip install pyyaml --index-url https://artifactory.prd.it.unity3d.com/artifactory/api/pypi/pypi/simple
     # TODO remove the "--user" command and the path prefix when we can migrate away from the custom bokken image
-    - python -m pip install unity-downloader-cli --index-url https://artifactory.prd.it.unity3d.com/artifactory/api/pypi/pypi/simple --upgrade --user
-    - /Users/bokken/Library/Python/3.7/bin/unity-downloader-cli -u {{ config.version }} -c editor --wait --fast
+    - python -m pip install unity-downloader-cli --index-url https://artifactory.prd.it.unity3d.com/artifactory/api/pypi/pypi/simple --upgrade
+    - unity-downloader-cli -u {{ config.version }} -c editor --wait --fast
     - python -u -m ml-agents.tests.yamato.training_int_tests
     # Backwards-compatibility tests.
     # If we make a breaking change to the communication protocol, these will need