Iotedgedev

- Updated Python Docker package versions to newest version and enable simulator dependencies

- Add support for layered deployment manifests when building, pushing and generating
- Add support for creating deployments in IoTHub via the new command: `iotedgedev iothub deploy`
- Add support for adding device tags via the new command: `iotedgedev tag`

- Added support for IoT Edge Runtime version 1.2
- Enable change of edgehub and edgeagent schema versions
- Added support for config generation, build and push off of a layered deployment manifest

- Added support for IoT Edge Runtime version 1.1
- Enabled dynamic Edge runtime selection in CLI with -er flag

- Remove support for Python2. Only Python 3.6 and 3.7 are currently supported.

Changed

- Remove explicit cryptography package install to resolve dependency conflicts so tests can run
- Add local registry support for Windows