Remove OSName Variable (Azure#12147)

Author: chidozieononiwu

sdk/eventhub/tests.yml

@@ -7,19 +7,15 @@ jobs:
       ServiceDirectory: eventhub
       Matrix:
         Linux_Python35:
-          OSName: 'Linux'
           OSVmImage: 'ubuntu-18.04'
           PythonVersion: '3.5'
         Linux_Python38:
-          OSName: 'Linux'
           OSVmImage: 'ubuntu-18.04'
           PythonVersion: '3.8'
         Windows_Python27:
-          OSName: 'Windows'
           OSVmImage: 'windows-2019'
           PythonVersion: '2.7'
         MacOs_Python37:
-          OSName: 'MacOS'
           OSVmImage: 'macOS-10.15'
           PythonVersion: '3.7'
       EnvVars:

sdk/servicebus/tests.yml

@@ -14,18 +14,14 @@ jobs:
         AZURE_TEST_RUN_LIVE: 'true'
       Matrix:
         Linux_Python35:
-          OSName: 'Linux'
           OSVmImage: 'ubuntu-18.04'
           PythonVersion: '3.5'
         MacOs_Python37:
-          OSName: 'MacOS'
           OSVmImage: 'macOS-10.15'
           PythonVersion: '3.7'
         Windows_Python27:
-          OSName: 'Windows'
           OSVmImage: 'windows-2019'
           PythonVersion: '2.7'
         Linux_Python38:
-          OSName: 'Linux'
           OSVmImage: 'ubuntu-18.04'
           PythonVersion: '3.8'