VOM: Additions to allow uses to UT applications that use VOM

- find object by key
- compare objects

Change-Id: I36ec8612be9482bcef7ceced2a59f7403f77b3e8
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vpp-api/vom/interface_span.hpp b/src/vpp-api/vom/interface_span.hpp
index 8d3d7cb..baa2054 100644
--- a/src/vpp-api/vom/interface_span.hpp
+++ b/src/vpp-api/vom/interface_span.hpp
@@ -103,7 +103,7 @@
   /**
    * The key type for interface_spans
    */
-  typedef std::pair<interface::key_type, interface::key_type> key_type_t;
+  typedef std::pair<interface::key_t, interface::key_t> key_t;
 
   /**
    * Find a singular instance in the DB for the interface passed
@@ -165,7 +165,7 @@
   /**
      e* It's the singular_db class that calls replay()
   */
-  friend class singular_db<key_type_t, interface_span>;
+  friend class singular_db<key_t, interface_span>;
 
   /**
    * Sweep/reap the object if still stale
@@ -202,14 +202,13 @@
    * A map of all interface span keyed against the interface to be
    * mirrored.
  */
-  static singular_db<key_type_t, interface_span> m_db;
+  static singular_db<key_t, interface_span> m_db;
 };
 
 /**
  * Ostream output for the key
  */
-std::ostream& operator<<(std::ostream& os,
-                         const interface_span::key_type_t& key);
+std::ostream& operator<<(std::ostream& os, const interface_span::key_t& key);
 };
 
 /*