Fix vm deploy to accept any network, not just internal

[yaroslav-gwit]

There is a hardcoded value internal in vm_deploy.go, which needs to be changed to a dynamic value (line 408):

    "networks": [
        {
            "network_adaptor_type": "virtio-net",
            "network_bridge": "internal",
            "network_mac": "{{ .MacAddress }}",
            "ip_address": "{{ .IpAddress }}",
            "comment": "Internal Network"
        }
    ],

This will allow to implement a new flag --use-network in the vm deploy command, but it will pick up the first available network from the list in the network config file by default.

[yaroslav-gwit]

Fix has been implemented using --network-name flag. If it's not supplied vm deploy will still choose a first available network, but now using custom network is possible:

	if len(networkName) < 1 {
		c.NetworkName = networkInfo[0].Name
		c.Subnet = networkInfo[0].Subnet
		c.NakedSubnet = strings.Split(networkInfo[0].Subnet, "/")[1]
		c.Gateway = networkInfo[0].Gateway
		c.NetworkComment = networkInfo[0].Comment
	} else {
		for _, v := range networkInfo {
			if networkName == v.Name {
				c.NetworkName = v.Name
				c.Subnet = v.Subnet
				c.NakedSubnet = strings.Split(v.Subnet, "/")[1]
				c.Gateway = v.Gateway
				c.NetworkComment = v.Comment
			}
		}
		if len(c.NetworkName) < 1 {
			return errors.New("network name supplied doesn't exist")
		}
	}