message: Allow an option to set CA file and CA Path to AWS SDK
diff: @@ -124,6 +124,14 @@ Aws::Client::ClientConfiguration& GetDefaultClientConfig() {
  cfg.requestTimeoutMs = timeout;
  }
  }
  + const char* ca_file = getenv("S3_CA_FILE");
  + if (ca_file) {
  + cfg.caFile = Aws::String(ca_file);
  + }
  + const char* ca_path = getenv("S3_CA_PATH");
  + if (ca_path) {
  + cfg.caPath = Aws::String(ca_path);
  + }
  init = true;
  }
  