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/arp_proxy_binding.cpp b/src/vpp-api/vom/arp_proxy_binding.cpp
index c44cda3..407436c 100644
--- a/src/vpp-api/vom/arp_proxy_binding.cpp
+++ b/src/vpp-api/vom/arp_proxy_binding.cpp
@@ -21,7 +21,7 @@
 /**
  * A DB of all ARP proxy bindings configs
  */
-singular_db<interface::key_type, arp_proxy_binding> arp_proxy_binding::m_db;
+singular_db<interface::key_t, arp_proxy_binding> arp_proxy_binding::m_db;
 
 arp_proxy_binding::event_handler arp_proxy_binding::m_evh;