network_manager: Add reload post hooks

We need this to handle deleting interfaces after reloading.

Change-Id: I0f3ca4cedf0e112bc285e4e2ecc1c3cad8ef5677
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/network_manager.hpp b/src/network_manager.hpp
index 98bbd41..146da33 100644
--- a/src/network_manager.hpp
+++ b/src/network_manager.hpp
@@ -126,6 +126,10 @@
     {
         reloadPreHooks.push_back(std::move(hook));
     }
+    inline void addReloadPostHook(fu2::unique_function<void()>&& hook)
+    {
+        reloadPostHooks.push_back(std::move(hook));
+    }
 
   protected:
     /** @brief Persistent sdbusplus DBus bus connection. */
@@ -156,6 +160,7 @@
 
     /** @brief List of hooks to execute during the next reload */
     std::vector<fu2::unique_function<void()>> reloadPreHooks;
+    std::vector<fu2::unique_function<void()>> reloadPostHooks;
 
     /** @brief Handles the recipt of an adminstrative state string */
     void handleAdminState(std::string_view state, unsigned ifidx);