Allow all host commands to be run with a prefix (e.g. `ssh
user@remotehost sudo`), such that yanger can be tested against the
current state of a remote system.
If a command wrapper _and_ a test directory is specified, the output
of all commands and files are recorded for use by a future test
execution.
Example:
1. Launch a `make run` instance and setup some config for which we
want to test yanger and cli-pretty
2. Capture the output of all commands needed to produce the data for
some YANG model:
`yanger -t /tmp/ifs -w "ixll -A ssh qtap1 sudo" ietf-interfaces`
3. Kill the instance (we do not need it any more)
4. Test cli-pretty using the captured state:
`yanger -t /tmp/ifs ietf-interfaces | cli-pretty show-interfaces
`
The yanger source grown significantly, code is disorganized, the
namespace is all over the place, etc.
Take a stab at remedying the situation by splitting out the individual
YANG models in separate Python modules, starting with ietf-system.
Tobias Waldekranz