Enable cppcoreguidelines-special-member-functions checks

Part of enforcing cpp core guidelines involves explicitly including all
constructors required on a non-trivial class.  We were missing quite a
few.  In all cases, the copy/move/and operator= methods are simply
deleted.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ie8d6e8bf2bc311fa21a9ae48b0d61ee5c1940999
diff --git a/include/async_resp.hpp b/include/async_resp.hpp
index 8e9584c..607d168 100644
--- a/include/async_resp.hpp
+++ b/include/async_resp.hpp
@@ -24,6 +24,8 @@
 
     AsyncResp(const AsyncResp&) = delete;
     AsyncResp(AsyncResp&&) = delete;
+    AsyncResp& operator=(const AsyncResp&) = delete;
+    AsyncResp& operator=(AsyncResp&&) = delete;
 
     ~AsyncResp()
     {