Reduce the number of maximum IPv6 addresses per interface

Based on the feedback from Amazon, the number of maximum number
of IPv6 addresses supported per VPC is severely below what we
originally thought.

vpc/limits.go

@@ -18,175 +18,175 @@ var interfaceLimits = map[string]map[string]limits{
 		"large": limits{
 			interfaces:               2,
 			ipAddressesPerInterface:  10,
-			ip6AddressesPerInterface: 10,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        100,
 		},
 		"xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"2xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"4xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        2000,
 		},
 		"10xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			// Is this number correct?
 			networkThroughput: 10000,
 		},
 		"16xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        23000,
 		},
 	},
 	"m5": {
 		"large": limits{
 			interfaces:               3,
 			ipAddressesPerInterface:  10,
-			ip6AddressesPerInterface: 10,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        100,
 		},
 		"xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"2xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"4xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        2000,
 		},
 		"12xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			// Is this number correct?
 			networkThroughput: 10000,
 		},
 		"24xlarge": limits{
 			interfaces:               15,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 50,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        23000,
 		},
 	},
 	"r4": {
 		"large": limits{
 			interfaces:               3,
 			ipAddressesPerInterface:  10,
-			ip6AddressesPerInterface: 10,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        1000,
 		},
 		"2xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        2000,
 		},
 		"4xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        4000,
 		},
 		"8xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        9000,
 		},
 		"16xlarge": limits{
 			interfaces:               15,
 			ipAddressesPerInterface:  24,
-			ip6AddressesPerInterface: 24,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        23000,
 		},
 	},
 	"p2": {
 		"xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			// Maybe?
 			networkThroughput: 2000,
 		},
 		"8xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        6000,
 		},
 		"16xlarge": limits{
 			interfaces:               8,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        20000,
 		},
 	},
 	"c5": {
 		"large": limits{
 			interfaces:               3,
 			ipAddressesPerInterface:  10,
-			ip6AddressesPerInterface: 10,
+			ip6AddressesPerInterface: 2,
 			// Maybe?
 			networkThroughput: 1000,
 		},
 		"xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        2000,
 		},
 		"2xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  15,
-			ip6AddressesPerInterface: 15,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        2000,
 		},
 		"4xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        4000,
 		},
 		"9xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  30,
-			ip6AddressesPerInterface: 30,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        10000,
 		},
 		"18xlarge": limits{
 			interfaces:               4,
 			ipAddressesPerInterface:  50,
-			ip6AddressesPerInterface: 50,
+			ip6AddressesPerInterface: 2,
 			networkThroughput:        23000,
 		},
 	},