Add redis-tools to docker-orchagent (#117)

Changes done in 7c9bffb
removed runtime dependency on redis from hiredis.
So we need to add them manually into orchagent docker

platform/mellanox/docker-orchagent-mlnx.mk

@@ -2,6 +2,6 @@
 
 DOCKER_ORCHAGENT_MLNX = docker-orchagent-mlnx.gz
 $(DOCKER_ORCHAGENT_MLNX)_PATH = $(DOCKERS_PATH)/docker-orchagent
-$(DOCKER_ORCHAGENT_MLNX)_DEPENDS += $(SWSS)
+$(DOCKER_ORCHAGENT_MLNX)_DEPENDS += $(SWSS) $(REDIS_TOOLS)
 $(DOCKER_ORCHAGENT_MLNX)_LOAD_DOCKERS += $(DOCKER_BASE)
 SONIC_DOCKER_IMAGES += $(DOCKER_ORCHAGENT_MLNX)