its-collector file bootstrap

[nbuffon]

1. Endpoints are mounted in a JSON file at /etc/iot3/endpoints.json
2. Credentials are mounted in a JSON file at /etc/iot3/identity.json

Like HTTP bootstrap the application will update its configuration with the credentials and paths to the services found in these files.

Bootstrap section has to be updated

[bootstrap]
identity = /etc/iot3/identity.json
endpoints = /etc/iot3/endpoints.json

Add a conditional in do_bootstrap(...) method to first look for the file bootstrap field (described above) and if not present fall back to the HTTP ones (as before).

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As described in architecture documentation:

• endpoints.json provides the services' URL port and protocols
• identity.json provides IOT3 ID, username and password to authenticate to those services