Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/protobufjs/google/api/http.proto

@@ -0,0 +1,31 @@
+syntax = "proto3";
+
+package google.api;
+
+message Http {
+
+    repeated HttpRule rules = 1;
+}
+
+message HttpRule {
+
+    oneof pattern {
+
+        string get = 2;
+        string put = 3;
+        string post = 4;
+        string delete = 5;
+        string patch = 6;
+        CustomHttpPattern custom = 8;
+    }
+
+    string selector = 1;
+    string body = 7;
+    repeated HttpRule additional_bindings = 11;
+}
+
+message CustomHttpPattern {
+
+    string kind = 1;
+    string path = 2;
+}