Add “Test Adapter Path” configuration field to VSTestRunnerTask

Problem Definition

After an upgrade to the latest version of vstest.console.exe (15.6.1) our build plans using the VSTestRunnerTask are breaking. The culprit is the "/UseVsixExtensions:true" which is hard-coded in the Java code and not configurable in the plug-in. The replacement option "/TestAdapter" is not supported yet.

See also: https://developercommunity.visualstudio.com/content/problem/215878/vstestconsoleexe-fails-to-run-the-gtest-unit-tests.html\\

Suggested Solution

Add configurable text box for Test Adapter Path to the task configuration.
Add vstest.console.exe version checking to the vstestrunner task to determine which options are required.

Workaround

Create a Command or script task and a MSTest Parser task and bypass using the VSTestRunner.