Inventory: Add host var and group to distinguish virtual machines

[DouglasHeriot]

ISSUE TYPE

• Feature Idea

SUMMARY

Currently the only way to distinguish a "device" from a "virtual machine" in the Inventory is to look for the presence of "device_type" host var. There's no easy way to create a group based on this when I need to write a playbook that only operates on VMs, or only on physical devices.

• I propose an "is_virtual" host var be created and added to all hosts as True or False.
• A group is_virtual could optionally be created with a new group_by option.

EXPECTED RESULTS

            "test100": {
                "device_type": "cisco-test",
                "is_virtual": false,
                "manufacturer": "cisco",
                "role": "core-switch",
                "site": "test-site",
                "tags": []
            },
            "test104-vm": {
                "cluster": "Test Cluster 2",
                "cluster_type": "test-cluster-type",
                "is_virtual": true,
                "tags": []
            }

ACTUAL RESULTS

            "test100": {
                "device_type": "cisco-test",
                "manufacturer": "cisco",
                "role": "core-switch",
                "site": "test-site",
                "tags": []
            },
            "test104-vm": {
                "cluster": "Test Cluster 2",
                "cluster_type": "test-cluster-type",
                "tags": []
            }

[FragmentedPacket]

Fixed via #202