Unable to issue operational (non-show) commands via 'cli' function

[p-sherratt]

The 'cli' function is a wrapper for the XML API 'cli' function. The limitation of this is documented by Cisco:

"CLI Command Limitations The CLI commands, which are supported through XML, are limited to CLI configuration commands and EXEC mode show commands (and responses) that are wrapped in <CLI> tags.

This prevents us for example from clearing interface or protocol statistics, or issuing "mpls traffic-eng" requests.

It would be very useful to have a 'raw cli' function which exits the XML interface to issue non-show commands. I understand that some of those commands might result in further interactive CLI prompts which could be awkward to catch (and suspect this is why Cisco devs have imposed the limitation in the XML API !), so the new function could be provided with this caveat...