generate-config: Updated generate config to support proxy configuration
generate-config: Updated generate config to support proxy configuration

generate_config.py now has extra arguments for proxy configuration and the
prompt has been expanded.

Signed-off-by: Ben Astell <ded3fae2663d1648fc922f7692e7914ea175e4a7@windriver.com>

rcwoolley/device-cloud-python,rcwoolley/device-cloud-python