[19.03 backport] revert controller: Check if IPTables is enabled for arrangeUserFilterRule

This change caused a regression, causing the DOCKER-USER chain
to not be created, despite iptables being enabled on the daemon.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 54a58760b6f0b3e50d6a592525413ac6599570a4
Component: engine

Author: thaJeztah

components/engine/hack/dockerfile/install/proxy.installer

@@ -3,7 +3,7 @@
 # LIBNETWORK_COMMIT is used to build the docker-userland-proxy binary. When
 # updating the binary version, consider updating github.com/docker/libnetwork
 # in vendor.conf accordingly
-LIBNETWORK_COMMIT=45c710223c5fbf04dc3028b9a90b51892e36ca7f
+LIBNETWORK_COMMIT=3eb39382bfa6a3c42f83674ab080ae13b0e34e5d # bump_19.03 branch
 
 install_proxy() {
 	case "$1" in

components/engine/vendor.conf

@@ -38,7 +38,7 @@ github.com/gofrs/flock                              7f43ea2e6a643ad441fc12d0ecc0
 # libnetwork
 
 # When updating, also update LIBNETWORK_COMMIT in hack/dockerfile/install/proxy.installer accordingly
-github.com/docker/libnetwork                        45c710223c5fbf04dc3028b9a90b51892e36ca7f
+github.com/docker/libnetwork                        3eb39382bfa6a3c42f83674ab080ae13b0e34e5d # bump_19.03 branch
 github.com/docker/go-events                         9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/armon/go-radix                           e39d623f12e8e41c7b5529e9a9dd67a1e2261f80
 github.com/armon/go-metrics                         eb0af217e5e9747e41dd5303755356b62d28e3ec