[lldp]: expose lldpcli command of lldp docker to host (#3473)

Lldp can not be configured in host environment, so we expose lldpcli command of lldp docker to host for configuring more convenient.

Author: yangshp1987

dockers/docker-lldp-sv2/base_image_files/lldpcli

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+DOCKER_EXEC_FLAGS="i"
+
+# Determine whether stdout is on a terminal
+if [ -t 1 ] ; then
+    DOCKER_EXEC_FLAGS+="t"
+fi
+
+docker exec -$DOCKER_EXEC_FLAGS lldp lldpcli "$@"

rules/docker-lldp-sv2.mk

@@ -29,3 +29,4 @@ $(DOCKER_LLDP_SV2)_RUN_OPT += --net=host --privileged -t
 $(DOCKER_LLDP_SV2)_RUN_OPT += -v /etc/sonic:/etc/sonic:ro
 
 $(DOCKER_LLDP_SV2)_BASE_IMAGE_FILES += lldpctl:/usr/bin/lldpctl
+$(DOCKER_LLDP_SV2)_BASE_IMAGE_FILES += lldpcli:/usr/bin/lldpcli