Remove SNAT rule that made container traffic look like it was coming …

…from its host.

worker/provisioner/lxc-broker.go

@@ -228,11 +228,7 @@ var iptablesRules = map[string]IptablesRule{
 	// need to check whether the rule exists because we only want to
 	// add it once. Exit code 0 means the rule exists, 1 means it
 	// doesn't
-	"iptablesSNAT": {
-		"nat",
-		"POSTROUTING",
-		"-o {{.HostIF}} -j SNAT --to-source {{.HostIP}}",
-	}, "iptablesForwardOut": {
+	"iptablesForwardOut": {
 		// Ensure that we have ACCEPT rules that apply to the containers
 		// that we are creating so any DROP rules further down the chain
 		// don't disrupt wanted traffic.