Fixed p4-14 programs not working on BMv2

The hack to deparse the packet_in breaks when using MAC addressess that
have many leading zeros (like in Mininet).

Change-Id: I509d98a21247903105cfb7d4206f8cc1a74acd3b
diff --git a/tools/test/p4src/p4-14/ecmp.p4 b/tools/test/p4src/p4-14/ecmp.p4
index 38962e6..0883ca7 100644
--- a/tools/test/p4src/p4-14/ecmp.p4
+++ b/tools/test/p4src/p4-14/ecmp.p4
@@ -32,8 +32,8 @@
     input {
         ecmp_hash_fields;
     }
-    algorithm : crc32;
-    output_width : 32;
+    algorithm : crc16;
+    output_width : 16;
 }
 
 action ecmp_group(group_id) {