changing extension-from-marketplace install to be sequential, not par…

…allel

Seems that when it's in parallel you get write locks on the logfile which causes most installs to fail, but it wasn't reported as a failure

src/services/extensions.ts

@@ -142,7 +142,8 @@ class ExtensionHelper {
     if (!installed) {
       try {
         const cli = `${binaryFullPath} --install-extension ${ext.publisherId}`;
-        await exec(cli);
+        let result = await exec(cli);
+        logger.appendLine(result.stdout);
         logger.appendLine(
           `Extension ${name} was installed from the marketplace.`
         );
@@ -175,15 +176,15 @@ class ExtensionHelper {
     logger.appendLine("");
     logger.appendLine("");
 
-    let installs = newExtensions.map((ext, i) => {
+    let codeBinary = this.settings.getCodeBinary();
+    for (let i = 0; i < newExtensions.length; i++) {
+      let ext = newExtensions[i];
       logger.appendLine(
         `Installing ${ext.name} (${i + 1} of ${newExtensions.length})`
       );
       logger.appendLine("");
-      return this.installExtension(ext, this.settings.getCodeBinary(), logger);
-    });
-
-    await Promise.all(installs);
+      await this.installExtension(ext, codeBinary, logger);
+    }
   }
 }