message: [Platform/Android] Read the adb server from an env variable if set
  Summary:
  The environment variable ANDROID_ADB_SERVER_PORT can be defined to have
  adbd litsen on a different port. Teach lldb how to understand this via
  simply checking the env var.
  Reviewers: xiaobai, clayborg
  Subscribers: srhines
diff: @@ -137,7 +137,12 @@ const std::string &AdbClient::GetDeviceID() const { return m_device_id; }
  Status AdbClient::Connect() {
  Status error;
  m_conn.reset(new ConnectionFileDescriptor);
  - m_conn->Connect("connect://localhost:5037", &error);
  + std::string port = "5037";
  + if (const char *env_port = std::getenv("ANDROID_ADB_SERVER_PORT")) {
  + port = env_port;
  + }
  + std::string uri = "connect://localhost:" + port;
  + m_conn->Connect(uri.c_str(), &error);
  return error;
  }
  