[docker-dhcp]: Fix the sonic build issue (#1659)

Install the built version of isc-dhcp-client in docker-dhcp-relay

Author: zhenggen-xu

rules/docker-dhcp-relay.mk

@@ -2,7 +2,7 @@
 
 DOCKER_DHCP_RELAY = docker-dhcp-relay.gz
 $(DOCKER_DHCP_RELAY)_PATH = $(DOCKERS_PATH)/docker-dhcp-relay
-$(DOCKER_DHCP_RELAY)_DEPENDS += $(ISC_DHCP_COMMON) $(ISC_DHCP_RELAY)
+$(DOCKER_DHCP_RELAY)_DEPENDS += $(ISC_DHCP_COMMON) $(ISC_DHCP_RELAY) $(ISC_DHCP_CLIENT)
 $(DOCKER_DHCP_RELAY)_LOAD_DOCKERS = $(DOCKER_CONFIG_ENGINE)
 SONIC_DOCKER_IMAGES += $(DOCKER_DHCP_RELAY)
 SONIC_INSTALL_DOCKER_IMAGES += $(DOCKER_DHCP_RELAY)

rules/isc-dhcp.mk

@@ -8,5 +8,9 @@ ISC_DHCP_COMMON = isc-dhcp-common_$(ISC_DHCP_VERSION)_amd64.deb
 $(ISC_DHCP_COMMON)_SRC_PATH = $(SRC_PATH)/isc-dhcp
 SONIC_MAKE_DEBS += $(ISC_DHCP_COMMON)
 
+ISC_DHCP_CLIENT = isc-dhcp-client_$(ISC_DHCP_VERSION)_amd64.deb
+$(ISC_DHCP_CLIENT)_SRC_PATH = $(SRC_PATH)/isc-dhcp
+SONIC_MAKE_DEBS += $(ISC_DHCP_CLIENT)
+
 ISC_DHCP_RELAY = isc-dhcp-relay_$(ISC_DHCP_VERSION)_amd64.deb
-$(eval $(call add_derived_package,$(ISC_DHCP_COMMON),$(ISC_DHCP_RELAY)))
+$(eval $(call add_derived_package,$(ISC_DHCP_COMMON),$(ISC_DHCP_RELAY),$(ISC_DHCP_CLIENT)))

src/isc-dhcp/Makefile

@@ -3,7 +3,8 @@ SHELL = /bin/bash
 .SHELLFLAGS += -e
 
 MAIN_TARGET = isc-dhcp-common_$(ISC_DHCP_VERSION)_amd64.deb
-DERIVED_TARGETS = isc-dhcp-relay_$(ISC_DHCP_VERSION)_amd64.deb
+DERIVED_TARGETS = isc-dhcp-relay_$(ISC_DHCP_VERSION)_amd64.deb \
+                  isc-dhcp-client_$(ISC_DHCP_VERSION)_amd64.deb
 
 $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	# Remove any stale files