Unique Ids for August entities to allow renames

[wonderslug]

Description:

This sets up unique ids on the august devices to allow for the devices to be used in the registry and support renames of them. This should be backwards compatible and does not effect the entity_id and name.

Example entry for configuration.yaml (if applicable):

august:
  login_method: email
  username: !secret august_user
  password: !secret august_password

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

[amelchio]

Looks good!

Just checking: what does the device_id look like?

[wonderslug]

The august devices have a cloud id that is not directly related to the serial number. These ids come across as part of the protocol and would be fairly unique per cloud account, and probably across the august system as well.

For the doorbell the doorbellID is used:

{  
   "doorbellID":"62d76ac1XXXX",
   "serialNumber":"D2GTD0XXXX",
   "appID":"august-iphone-v5",
   "installUserID":"8f9e6c84-cc11-4971-b5df-XXXXXXXXXXXX",
   "name":"Front Door",
   "installDate":"2017-12-17T23:44:28.697Z",
   ....

For the lock the lockID is used :

{  
   "LockName":"Front Door",
   "Type":3,
   "Created":"2017-10-21T22:24:56.754Z",
   "Updated":"2017-10-21T22:24:56.754Z",
   "LockID":"D4F29513A742499DAAE2888F3F3XXXXX",
   "HouseID":"e9d48d9a-3210-4cd3-a6b4-XXXXXXXXXXXX",
   "HouseName":"Home",
   "Calibrated":false,
   "skuNumber":"AUG-SL03-C02-S03",
    ....