VPP-310 Mapping algorithm compute wrong ea-bits

Mapping of IPv4 prefixes ended up writing past IPv6 prefix + EA bits
length.
(Added some unit testing code).

Change-Id: I59893b44eea5cebf00a23afc405832741f84cf4f
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/build-data/platforms/vpp_lite.mk b/build-data/platforms/vpp_lite.mk
index 9375a7a..94e6951 100644
--- a/build-data/platforms/vpp_lite.mk
+++ b/build-data/platforms/vpp_lite.mk
@@ -24,6 +24,9 @@
 
 vpp_lite_uses_dpdk = no
 
+# Uncoment to enable building unit tests
+#vpp_lite_enable_tests = yes
+
 vpp_lite_root_packages = vpp vlib vlib-api vnet svm vpp-api-test \
 	vpp-api gmod