add agent flag disable-apiserver-lb (k3s-io#8717)

* add node flag disable-agent-lb
* add agent flag disable-apiserver-lb

Co-authored-by: Brad Davidson <brad@oatmail.org>
Signed-off-by: chenk008 <kongchen28@gmail.com>
(cherry picked from commit b47cbbf)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

pkg/cli/cmds/agent.go

@@ -222,6 +222,11 @@ var (
 		Usage:       "(deprecated) use --flannel-backend=none",
 		Destination: &AgentConfig.NoFlannel,
 	}
+	DisableAgentLBFlag = &cli.BoolFlag{
+		Name:        "disable-apiserver-lb",
+		Usage:       "(agent/networking) (experimental) Disable the agent's client-side load-balancer and connect directly to the configured server address",
+		Destination: &AgentConfig.DisableLoadBalancer,
+	}
 )
 
 func CheckSELinuxFlags(ctx *cli.Context) error {
@@ -310,6 +315,7 @@ func NewAgentCommand(action func(ctx *cli.Context) error) cli.Command {
 			},
 			VPNAuth,
 			VPNAuthFile,
+			DisableAgentLBFlag,
 		},
 	}
 }