Remove VSTESTPATH in config.xml since it's retrieved from registry

Author: HsuanyaTsai

ProtocolTestManager/KernelTest/Resources/etc/TestAppConfig/config.xml

@@ -41,5 +41,4 @@
     </AdapterItem>
   </Adapters>
   <TestSetting>Bin\ServerLocalTestRun.testrunconfig</TestSetting>
-  <VSTestPath>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe</VSTestPath>
 </Config>

ProtocolTestManager/Plugins/ADODPlugin/ADODPlugin/config.xml

@@ -21,5 +21,4 @@
     </Group>
 	</ConfigCaseRule>
 	<TestSetting>Bin\ODLocalTestRun.testrunconfig</TestSetting>
-	<VSTestPath>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe</VSTestPath>
 </Config>

ProtocolTestManager/Plugins/BranchCachePlugin/BranchCachePlugin/config.xml

@@ -44,5 +44,4 @@
     </Group>
   </ConfigCaseRule>
   <TestSetting>Bin\LocalTestRun.testsettings</TestSetting>
-  <VSTestPath>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe</VSTestPath>
 </Config>

ProtocolTestManager/Plugins/KerberosPlugin/KerberosPlugin/config.xml

@@ -71,5 +71,4 @@
     </Group>
   </ConfigCaseRule>
   <TestSetting>Bin\ServerLocalTestRun.testrunconfig</TestSetting>
-  <VSTestPath>C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe</VSTestPath>
 </Config>