Add dev sdk packages to runtime dependency (#109)

Symbolic links for sx libraries are in dev packages,
so we need them installed in containers too

platform/mellanox/mlnx-sai.mk

@@ -8,5 +8,5 @@ export MLNX_SAI_VERSION MLNX_SAI_REVISION
 MLNX_SAI = mlnx-sai_1.mlnx.$(MLNX_SAI_VERSION)_amd64.deb
 $(MLNX_SAI)_SRC_PATH = $(PLATFORM_PATH)/mlnx-sai
 $(MLNX_SAI)_DEPENDS += $(MLNX_SDK_DEBS)
-$(MLNX_SAI)_RDEPENDS += $(MLNX_SDK_RDEBS)
+$(MLNX_SAI)_RDEPENDS += $(MLNX_SDK_RDEBS) $(MLNX_SDK_DEBS)
 SONIC_MAKE_DEBS += $(MLNX_SAI)