Support passing multiple IP addresses

[carroarmato0]

The current implementation only allows for 1 IP entry per cache.

{
	"ips": {
		"steam":	"10.10.3.11",
		"origin":	"10.10.3.12",
		"blizzard":	"10.10.3.13",
		"windows":	"10.10.3.14",
		"riot":		"10.10.3.15",
		"generic":	"10.10.3.16"
	},
	"cache_domains": {
		"default": 	"generic",
		"blizzard": 	"blizzard",
		"origin": 	"origin",
		"riot": 	"riot",
		"steam": 	"steam",
		"wsus": 	"windows",
		"xboxlive": 	"windows"
	}
}

In some scenarios, it is desirable to respond with multiple IP addresses ( distribute the load through poor-man round-robin through DNS.)

This patch allows passing an array of IP address for unbound and dnsmasq.

This patch is also meant to help with the following issue:
lancachenet/monolithic#16

{
	"ips": {
		"steam":	["10.10.3.10", "10.10.3.11", "10.10.3.12", "10.10.3.13"],
		"origin":	["10.10.3.10", "10.10.3.11", "10.10.3.12", "10.10.3.13"],
		"blizzard":	["10.10.3.10", "10.10.3.11", "10.10.3.12", "10.10.3.13"],
		"windows":	["10.10.3.10", "10.10.3.11", "10.10.3.12", "10.10.3.13"],
		"riot":		["10.10.3.10", "10.10.3.11", "10.10.3.12", "10.10.3.13"],
		"generic":	"10.10.3.14"
	},
	"cache_domains": {
		"default": 	"generic",
		"blizzard": 	"blizzard",
		"origin": 	"origin",
		"riot": 	"riot",
		"steam": 	"steam",
		"wsus": 	"windows",
		"xboxlive": 	"windows"
	}
}

Signed-off-by: Christophe Vanlancker carroarmato0@inuits.eu

[VibroAxe]

@Crabbey does this look good to you?