move all analysis options to repo root (#5882)

This moves all of the various .analysis_options* files to the flutter repo root so that it's easier to
* remember to keep them all in sync, and
* easily refer customers to them

packages/flutter_tools/lib/src/commands/analyze.dart

@@ -218,8 +218,8 @@ class AnalyzeCommand extends FlutterCommand {
     options.dartSdkPath = argResults['dart-sdk'];
     options.packageMap = packages;
     options.analysisOptionsFile = flutterRepo
-      ? path.join(Cache.flutterRoot, '.analysis_options_flutter_analyze')
-      : path.join(Cache.flutterRoot, 'packages', 'flutter_tools', 'flutter_analysis_options');
+      ? path.join(Cache.flutterRoot, '.analysis_options_repo')
+      : path.join(Cache.flutterRoot, '.analysis_options_user');
     AnalysisDriver analyzer = new AnalysisDriver(options);
 
     // TODO(pq): consider error handling