M2MBridge updates

• M2MBridge updates are managed from the amtechM2mBridge template thing and the cloned amtechM2mBridge instance used in the configuration of the M2MBridge.
• The first time you run the bridge, the software running requests to the AMTech Cloud a download for the version specified in the configured template. Note that this first time you run the bridge, you need to be sure that the bridge has a configured Internet connection. Otherwise the download will fail.
• After that the M2MBridge service is started and a clone of that template is generated with the same version specified in the template.
• Any further change to that instance version will be honored by the bridge and an over-the-air update will be applied with a respective automatic restart of the service.