Added docker instrumentor

resource_system/src/grunt/instrument_docker.c

@@ -7,12 +7,22 @@ internal_function
 noreturn
 void* dockerProcessLoop (void *arg)
 {
-    unused_variable(arg);
-
     pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, NULL);
 
     while (true) {
         // TODO(naman): Get data
+        Char *data_cmd = NULL;
+        sbufPrint(data_cmd, "docker stats %s", (Char*)arg);
+        FILE* data_file = popen(data_cmd, "r");
+
+
+        fseek(data_file, 0, SEEK_END);
+        long size = ftell(data_file);
+        fseek(data_file, 0, SEEK_SET);
+        Char *data = calloc((Size)size + 1, sizeof(*data));
+        fread(data, 1, (Size)size + 1, data_file);
+        fclose(data_file);
+
         Char *json = NULL;
 
         Char *output = NULL;