Test Infra: Add plugin support

This patch adds plugin path to vpp commandline arguments
when 'make test' is run.
Hence, test cases can test plugins.

Change-Id: Ib90efa1f62e03b45b84533c49c7a5d040aa8cddf
Signed-off-by: Pierre Pfister <ppfister@cisco.com>
diff --git a/Makefile b/Makefile
index 3db644e..4b7170d 100644
--- a/Makefile
+++ b/Makefile
@@ -192,6 +192,7 @@
 	@make -C test \
 	  VPP_TEST_BIN=$(BR)/install-$(1)-native/vpp/bin/vpp \
 	  VPP_TEST_API_TEST_BIN=$(BR)/install-$(1)-native/vpp-api-test/bin/vpp_api_test \
+	  VPP_TEST_PLUGIN_PATH=$(BR)/install-$(1)-native/plugins/lib64/vpp_plugins \
 	  V=$(V) TEST=$(TEST)
 endef
 
@@ -199,14 +200,14 @@
 ifeq ($(OS_ID),ubuntu)
 	@sudo -E apt-get $(CONFIRM) $(FORCE) install python-dev python-scapy
 endif
-	@make -C $(BR) PLATFORM=vpp_lite TAG=vpp_lite vpp-install vpp-api-test-install
+	@make -C $(BR) PLATFORM=vpp_lite TAG=vpp_lite plugins-install vpp-install vpp-api-test-install
 	$(call test,vpp_lite)
 
 test-debug:
 ifeq ($(OS_ID),ubuntu)
 	@sudo -E apt-get $(CONFIRM) $(FORCE) install python-dev python-scapy
 endif
-	@make -C $(BR) PLATFORM=vpp_lite TAG=vpp_lite_debug vpp-install vpp-api-test-install
+	@make -C $(BR) PLATFORM=vpp_lite TAG=vpp_lite_debug plugins-install vpp-install vpp-api-test-install
 	$(call test,vpp_lite_debug)
 
 retest: