re-align userland-proxy with vendored version
# 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=ebcade70ad1059b070d0040d798ecca359bc5fed
+LIBNETWORK_COMMIT=48f846327bbe6a0dce0c556e8dc9f5bb939d5c16
install_proxy() {
case "$1" in
