Allow user to control the default address pools

- Via daemon flag --default-address-pools base=<CIDR>,size=<int>

Signed-off-by: Elango Siva  <elango@docker.com>
Upstream-commit: 173b3c364ebedd56bd5b6c190a9b41f592ba57d6
Component: engine

components/engine/cmd/dockerd/config_unix.go

@@ -18,6 +18,7 @@ func installConfigFlags(conf *config.Config, flags *pflag.FlagSet) {
 	installUnixConfigFlags(conf, flags)
 
 	conf.Ulimits = make(map[string]*units.Ulimit)
+	conf.NetworkConfig.DefaultAddressPools = opts.PoolsOpt{}
 
 	// Set default value for `--default-shm-size`
 	conf.ShmSize = opts.MemBytes(config.DefaultShmSize)
@@ -44,4 +45,6 @@ func installConfigFlags(conf *config.Config, flags *pflag.FlagSet) {
 	flags.Var(&conf.ShmSize, "default-shm-size", "Default shm size for containers")
 	flags.BoolVar(&conf.NoNewPrivileges, "no-new-privileges", false, "Set no-new-privileges by default for new containers")
 	flags.StringVar(&conf.IpcMode, "default-ipc-mode", config.DefaultIpcMode, `Default mode for containers ipc ("shareable" | "private")`)
+	flags.Var(&conf.NetworkConfig.DefaultAddressPools, "default-address-pool", "Default address pools for node specific local networks")
+
 }