Revert "Remove the interfaces removed handler"

Listening for the interfaces removed signal is required so
that ibm-logging can remove its objects when phosphor-logging
prunes its entries after hitting capacity.

Previously, ibm-logging depended on someone calling Delete or
DeleteAll to remove objects.

This reverts commit 19ff79fafee4bdf695ae71522715e16bedb1349a.

Tested: Delete xyz.openbmc_project.Logging entries and verify
        these logs get deleted too.

Change-Id: Ib172100cc455563fc026330182d46b96f97679b5
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/manager.hpp b/manager.hpp
index d09d103..0320b0c 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -66,6 +66,16 @@
     void interfaceAdded(sdbusplus::message::message& msg);
 
     /**
+     * The callback for an interfaces removed signal
+     *
+     * Removes the IBM interfaces for the log entry
+     * that was just removed.
+     *
+     * @param[in] msg - the sdbusplus message
+     */
+    void interfaceRemoved(sdbusplus::message::message& msg);
+
+    /**
      * Creates the IBM interfaces for all existing error log
      * entries.
      */
@@ -135,6 +145,11 @@
      */
     sdbusplus::bus::match_t addMatch;
 
+    /**
+     * The match object for interfacesRemoved
+     */
+    sdbusplus::bus::match_t removeMatch;
+
     using EntryID = uint32_t;
     using InterfaceMap = std::map<InterfaceType, std::experimental::any>;
     using EntryMap = std::map<EntryID, InterfaceMap>;