MINOR: hlua/event_hdl: expose proxy_uuid variable in server events

Adding proxy_uuid to ServerEvent class.
proxy_uuid contains the uuid of the proxy to which the server belongs
diff --git a/doc/lua-api/index.rst b/doc/lua-api/index.rst
index f25f9dc..1bb4997 100644
--- a/doc/lua-api/index.rst
+++ b/doc/lua-api/index.rst
@@ -1405,6 +1405,10 @@
 
   Contains the name of the proxy to which the server belongs
 
+.. js:attribute:: ServerEvent.proxy_uuid
+
+  Contains the uuid of the proxy to which the server belongs
+
 .. js:attribute:: ServerEvent.reference
 
   Reference to the live server (A :ref:`server_class`).
diff --git a/src/hlua.c b/src/hlua.c
index e6856c8..747e6e8 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -9059,6 +9059,10 @@
 		lua_pushstring(hlua->T, "proxy_name");
 		lua_pushstring(hlua->T, e_server->safe.proxy_name);
 		lua_settable(hlua->T, -3);
+		/* Add server proxy uuid */
+		lua_pushstring(hlua->T, "proxy_uuid");
+		lua_pushinteger(hlua->T, e_server->safe.proxy_uuid);
+		lua_settable(hlua->T, -3);
 
 		/* attempt to provide reference server object
 		 * (if it wasn't removed yet, SERVER_DEL will never succeed here)