- updated old gitlab.com URLs by new labs.etsi.org URLs.
- updated Context to use secrets generated by CockroachDB and NATS

This commit provides support for automated invokation
of the ztpUpdate RPC upon a DEVICE_UPDATED event.
When this event is triggered, the Automation component
fetches the associated device configuration and applies
it to the device.

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>