New service `routerd` performs exactly single task: based on incoming
API call service name, it routes the requests to the appropriate Talos
service (`networkd`, `osd`, etc.) Service `routerd` listens of file
socket and routes requests to file sockets.
Service `apid` now does single task as well:
* it either fans out request to other `apid` services running on other
nodes and aggregates responses
* or it forwards requests to local `routerd` (when request destination
is local node)
Cons:
* one more proxying layer on request path
Pros:
* more clear service roles
* `routerd` is part of core Talos, services should register with it to
expose their API; no auth in the service (not exposed to the world)
* `apid` might be replaced with other implementation, it depends on TLS infra,
auth, etc.
* `apid` is better segregated from other Talos services (can only access
`routerd`, can't talk to other Talos services directly, so less exposure
in case of a bug)
This change is no-op to the end users.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
