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/om.hpp b/src/vpp-api/vom/om.hpp
index f470c5e..e68d5ea 100644
--- a/src/vpp-api/vom/om.hpp
+++ b/src/vpp-api/vom/om.hpp
@@ -16,6 +16,7 @@
 #ifndef __VOM_OM_H__
 #define __VOM_OM_H__
 
+#include <algorithm>
 #include <memory>
 #include <set>