PANOS Proxy: show running nat-policy

[AmbicaY]

Need to query the NAT policy

The current execution module for panos https://docs.saltstack.com/en/latest/ref/modules/all/salt.modules.panos.html does not a get function to query the NAT policy on a PAN device. It will be really helpful to add this function. Basically an output of "show running nat-policy" command.

[krionbsd]

Hey, thank you for submitting it, as I don't have panos available to test it, could you add your code to salt/modules/panos.py and probably a test case into tests/unit/modules/test_panos.py, so we might progress on this feature request.