[docker-iccpd]: Upgrade docker-iccpd to buster (#4984)

Signed-off-by: Joyas Joseph <joyas_joseph@dell.com>

dockers/docker-iccpd/Dockerfile.j2

@@ -1,5 +1,5 @@
 {% from "dockers/dockerfile-macros.j2" import install_debian_packages, install_python_wheels, copy_files %}
-FROM docker-config-engine-stretch
+FROM docker-config-engine-buster
 
 ARG docker_container_name
 RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#%syslogtag%/;" /etc/rsyslog.conf

rules/docker-iccpd.mk

@@ -5,18 +5,16 @@ DOCKER_ICCPD = $(DOCKER_ICCPD_STEM).gz
 DOCKER_ICCPD_DBG = $(DOCKER_ICCPD_STEM)-$(DBG_IMAGE_MARK).gz
 $(DOCKER_ICCPD)_PATH = $(DOCKERS_PATH)/$(DOCKER_ICCPD_STEM)
 $(DOCKER_ICCPD)_DEPENDS += $(SWSS) $(ICCPD)
-$(DOCKER_ICCPD)_DBG_DEPENDS = $($(DOCKER_CONFIG_ENGINE_STRETCH)_DBG_DEPENDS)
+$(DOCKER_ICCPD)_DBG_DEPENDS = $($(DOCKER_CONFIG_ENGINE_BUSTER)_DBG_DEPENDS)
 $(DOCKER_ICCPD)_DBG_DEPENDS += $(SWSS_DBG) $(LIBSWSSCOMMON_DBG) $(ICCPD_DBG)
-$(DOCKER_ICCPD)_DBG_IMAGE_PACKAGES = $($(DOCKER_CONFIG_ENGINE_STRETCH)_DBG_IMAGE_PACKAGES)
-$(DOCKER_ICCPD)_LOAD_DOCKERS += $(DOCKER_CONFIG_ENGINE_STRETCH)
+$(DOCKER_ICCPD)_DBG_IMAGE_PACKAGES = $($(DOCKER_CONFIG_ENGINE_BUSTER)_DBG_IMAGE_PACKAGES)
+$(DOCKER_ICCPD)_LOAD_DOCKERS += $(DOCKER_CONFIG_ENGINE_BUSTER)
 
 ifeq ($(ENABLE_ICCPD), y)
 SONIC_DOCKER_IMAGES += $(DOCKER_ICCPD)
 SONIC_INSTALL_DOCKER_IMAGES += $(DOCKER_ICCPD)
-SONIC_STRETCH_DOCKERS += $(DOCKER_ICCPD)
 SONIC_DOCKER_DBG_IMAGES += $(DOCKER_ICCPD_DBG)
 SONIC_INSTALL_DOCKER_DBG_IMAGES += $(DOCKER_ICCPD_DBG)
-SONIC_STRETCH_DBG_DOCKERS += $(DOCKER_ICCPD_DBG)
 endif
 
 $(DOCKER_ICCPD)_CONTAINER_NAME = iccpd