remove WARNING writter twice

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

server.go

@@ -1631,11 +1631,11 @@ func (srv *Server) ContainerCreate(job *engine.Job) engine.Status {
 		return job.Errorf("Minimum memory limit allowed is 512k")
 	}
 	if config.Memory > 0 && !srv.runtime.sysInfo.MemoryLimit {
-		job.Errorf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n")
+		job.Errorf("Your kernel does not support memory limit capabilities. Limitation discarded.\n")
 		config.Memory = 0
 	}
 	if config.Memory > 0 && !srv.runtime.sysInfo.SwapLimit {
-		job.Errorf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
+		job.Errorf("Your kernel does not support swap limit capabilities. Limitation discarded.\n")
 		config.MemorySwap = -1
 	}
 	resolvConf, err := utils.GetResolvConf()
@@ -1643,7 +1643,7 @@ func (srv *Server) ContainerCreate(job *engine.Job) engine.Status {
 		return job.Error(err)
 	}
 	if !config.NetworkDisabled && len(config.Dns) == 0 && len(srv.runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
-		job.Errorf("WARNING: Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", defaultDns)
+		job.Errorf("Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", defaultDns)
 		config.Dns = defaultDns
 	}
 
@@ -1659,7 +1659,7 @@ func (srv *Server) ContainerCreate(job *engine.Job) engine.Status {
 		return job.Error(err)
 	}
 	if !container.Config.NetworkDisabled && srv.runtime.sysInfo.IPv4ForwardingDisabled {
-		job.Errorf("WARNING: IPv4 forwarding is disabled.\n")
+		job.Errorf("IPv4 forwarding is disabled.\n")
 	}
 	srv.LogEvent("create", container.ID, srv.runtime.repositories.ImageName(container.Image))
 	// FIXME: this is necessary because runtime.Create might return a nil container