CTest controller is updated on reconfig (related to issue microsoft#212…

…).

src/cmake-tools.ts
==================
* CMakeTools.configure now executes CTestDriver.reloadTests

src/driver.ts
=============
* new function CMakeDriver.testfilePath
	Returns the path to CTestTestfile.cmake in the build directory
* CMakeDriver._cleanPriorConfiguration
	Added the removal of CTestTestfile.cmake from the build directory.

src/cmake-tools.ts

@@ -528,6 +528,7 @@ export class CMakeTools implements vscode.Disposable, api.CMakeToolsAPI {
                 if (retc === 0) {
                   await this._refreshCompileDatabase(drv.expansionOptions);
                 }
+                await this._ctestController.reloadTests(drv);
                 this._onReconfiguredEmitter.fire();
                 return retc;
               } finally {

src/driver.ts

@@ -272,6 +272,7 @@ export abstract class CMakeDriver implements vscode.Disposable {
   protected async _cleanPriorConfiguration() {
     const build_dir = this.binaryDir;
     const cache = this.cachePath;
+    const test_file = this.testFilePath;
     const cmake_files = path.join(build_dir, 'CMakeFiles');
     if (await fs.exists(cache)) {
       log.info('Removing ', cache);
@@ -281,6 +282,10 @@ export abstract class CMakeDriver implements vscode.Disposable {
       log.info('Removing ', cmake_files);
       await fs.rmdir(cmake_files);
     }
+    if (await fs.exists(test_file)) {
+      log.info('Removing ', test_file);
+      await fs.unlink(test_file);
+    }
   }
 
   /**
@@ -411,6 +416,15 @@ export abstract class CMakeDriver implements vscode.Disposable {
     return util.lightNormalizePath(file);
   }
 
+  /**
+   * @brief Get the path to the CTestTestfile.cmake file in the build directory
+   */
+  get testFilePath(): string {
+    // TODO: Test file path can change if build dir changes at runtime.
+    const file = path.join(this.binaryDir, 'CTestTestfile.cmake');
+    return util.lightNormalizePath(file);
+  }
+
   /**
    * Get the current build type, according to the current selected variant.
    *