Forced endpoint cleanup

docker's network disconnect api now supports `Force` option which can be
used to force cleanup an endpoint from any host in the cluster.

Signed-off-by: Madhu Venugopal <madhu@docker.com>

docs/reference/commandline/network_disconnect.md

@@ -12,8 +12,10 @@ parent = "smn_cli"
 
     Usage:  docker network disconnect [OPTIONS] NETWORK CONTAINER
 
+
     Disconnects a container from a network
 
+      -f, --force        Force the container to disconnect from a network
       --help             Print usage
 
 Disconnects a container from a network. The container must be running to disconnect it from the network.

man/docker-network-disconnect.1.md

@@ -7,6 +7,7 @@ docker-network-disconnect - disconnect a container from a network
 # SYNOPSIS
 **docker network disconnect**
 [**--help**]
+[**--force**]
 NETWORK CONTAINER
 
 # DESCRIPTION
@@ -25,6 +26,9 @@ Disconnects a container from a network.
 **CONTAINER**
     Specify container name
 
+**--force**
+  Force the container to disconnect from a network
+
 **--help**
   Print usage statement