build: enable TSLint on the packages folder

packages/compiler-cli/test/diagnostics/mocks.ts

@@ -110,12 +110,14 @@ const summaryResolver = new AotSummaryResolver(
     staticSymbolCache);
 
 export class DiagnosticContext {
+  // tslint:disable
   _analyzedModules: NgAnalyzedModules;
   _staticSymbolResolver: StaticSymbolResolver|undefined;
   _reflector: StaticReflector|undefined;
   _errors: {e: any, path?: string}[] = [];
   _resolver: CompileMetadataResolver|undefined;
   _refletor: StaticReflector;
+  // tslint:enable
 
   constructor(
       public service: ts.LanguageService, public program: ts.Program,

packages/compiler-cli/test/diagnostics/symbol_query_spec.ts

@@ -45,7 +45,7 @@ describe('symbol query', () => {
     options.basePath = '/quickstart';
     const aotHost = new CompilerHost(program, options, host, {verboseInvalidExpression: true});
     context = new DiagnosticContext(service, program, checker, aotHost);
-    query = getSymbolQuery(program, checker, sourceFile, emptyPipes)
+    query = getSymbolQuery(program, checker, sourceFile, emptyPipes);
   });
 
   it('should be able to get undefined for an unknown symbol', () => {

packages/compiler-cli/test/ngc_spec.ts

@@ -437,12 +437,11 @@ describe('ngc command-line', () => {
         throw new Error(`Expected ${fileName} to be emitted (outDir: ${outDir})`);
       }
     };
-    const shouldNotExist =
-        (fileName: string) => {
-          if (fs.existsSync(path.resolve(outDir, fileName))) {
-            throw new Error(`Did not expect ${fileName} to be emitted (outDir: ${outDir})`);
-          }
-        }
+    const shouldNotExist = (fileName: string) => {
+      if (fs.existsSync(path.resolve(outDir, fileName))) {
+        throw new Error(`Did not expect ${fileName} to be emitted (outDir: ${outDir})`);
+      }
+    };
 
     it('should be able to generate a flat module library', () => {
       writeConfig(`