minor tweaks to the output for flutter_tools (#11115)

* minor tweaks to the output for flutter_tools

* update test expectations

packages/flutter_tools/lib/src/android/android_studio_validator.dart

@@ -69,7 +69,7 @@ class NoAndroidStudioValidator extends DoctorValidator {
               'but Android Studio not found at this location.'));
     }
     messages.add(new ValidationMessage(
-        'Android Studio not found. Download from https://developer.android.com/studio/index.html\n'
+        'Android Studio not found; download from https://developer.android.com/studio/index.html\n'
         '(or visit https://flutter.io/setup/#android-setup for detailed instructions).'));
 
     return new ValidationResult(ValidationType.missing, messages,

packages/flutter_tools/lib/src/android/gradle.dart

@@ -132,7 +132,7 @@ Future<String> _ensureGradle() async {
 // Note: Gradle may be bootstrapped and possibly downloaded as a side-effect
 // of validating the Gradle executable. This may take several seconds.
 Future<String> _initializeGradle() async {
-  final Status status = logger.startProgress('Initializing Gradle...', expectSlowOperation: true);
+  final Status status = logger.startProgress('Initializing gradle...', expectSlowOperation: true);
   String gradle = _locateProjectGradlew();
   if (gradle == null) {
     _injectGradleWrapper();

packages/flutter_tools/lib/src/base/logger.dart

@@ -221,7 +221,7 @@ class VerboseLogger extends Logger {
     stopwatch.reset();
 
     String prefix;
-    const int prefixWidth = 12;
+    const int prefixWidth = 8;
     if (millis == 0) {
       prefix = ''.padLeft(prefixWidth);
     } else {

packages/flutter_tools/lib/src/ios/mac.dart

@@ -124,7 +124,7 @@ class Xcode {
   final RegExp xcodeVersionRegex = new RegExp(r'Xcode ([0-9.]+)');
   void _updateXcodeVersion() {
     try {
-      _xcodeVersionText = processManager.runSync(<String>['/usr/bin/xcodebuild', '-version']).stdout.replaceAll('\n', ', ');
+      _xcodeVersionText = processManager.runSync(<String>['/usr/bin/xcodebuild', '-version']).stdout.trim().replaceAll('\n', ', ');
       final Match match = xcodeVersionRegex.firstMatch(xcodeVersionText);
       if (match == null)
         return;