* `clixon-test` built in `docker/test`
* Renamed from `clixon-system` built in `docker/main`
* `clixon-example` built in `docker/example`
* Added netconf ssh subsystem
* Renamed from `clixon` built in `docker/base`
* Added ietf-yang-schema-mount@2019-01-14.yang
* Extra RPC:s will be called _after_ the basic ones.
* One specific usecase is hook for `copy-config` (see [doc/ROADMAP.md] that can be implemented thus way.
* `rpc_callback_register` added a namespace parameter. Example:
```
rpc_callback_register(h, empty_rpc, NULL, "urn:example:clixon", "empty");
```
