arduino: Implement HTTP redirect handling

[Alan Noble]

The ESP/Arduino HTTP client currently does not handle redirects, which is required for: https://bitbucket.org/ausocean/iot/issues/78/arduino-use-forwardable-subdomain-as

Adopting the ESP8266HTTPClient library, although it does not automatically handle redirects, will simply the implementation of this feature.

‌

[Alan Noble]

Implemented in https://bitbucket.org/ausocean/iot/commits/c5c281fe0374e44c494e6593490d72f162dd1a27