tests: use BOOST_TEST_CONTEXT and BOOST_DATA_TEST_CASE where possible

Fix the last two "CanBePrefix unset" warnings in unit tests

Change-Id: Ifd2420ae98e7c4741a1c20e7fa0d52f74d7178c8
diff --git a/tests/unit/security/validator-fixture.hpp b/tests/unit/security/validator-fixture.hpp
index 8da34f0..343e363 100644
--- a/tests/unit/security/validator-fixture.hpp
+++ b/tests/unit/security/validator-fixture.hpp
@@ -185,6 +185,12 @@
     return name;
   }
 
+  static Data
+  makePacket(const Name& name)
+  {
+    return Data(name);
+  }
+
   static shared_ptr<ValidationState>
   makeState()
   {
@@ -203,6 +209,12 @@
   static Name
   makeName(Name name, KeyChain& keyChain);
 
+  static Interest
+  makePacket(const Name& name)
+  {
+    return Interest(name).setCanBePrefix(false);
+  }
+
   static shared_ptr<ValidationState>
   makeState()
   {
@@ -223,6 +235,12 @@
   static Name
   makeName(Name name, KeyChain& keyChain);
 
+  static Interest
+  makePacket(const Name& name)
+  {
+    return Interest(name).setCanBePrefix(false);
+  }
+
   static shared_ptr<ValidationState>
   makeState()
   {