shared,all: add and use DBUS_INTERFACE_OBJECT_MANAGER define

shared/nm-std-aux/nm-dbus-compat.h

@@ -31,6 +31,8 @@
 /** The interface supported by most dbus peers */
 #define DBUS_INTERFACE_PEER           "org.freedesktop.DBus.Peer"
 
+#define DBUS_INTERFACE_OBJECT_MANAGER "org.freedesktop.DBus.ObjectManager"
+
 /** This is a special interface whose methods can only be invoked
  * by the local implementation (messages from remote apps aren't
  * allowed to specify this interface).

src/devices/bluetooth/nm-bluez-common.h

@@ -13,7 +13,6 @@
 #define NM_BLUEZ_SERVICE           "org.bluez"
 
 #define NM_BLUEZ_MANAGER_PATH      "/"
-#define NM_OBJECT_MANAGER_INTERFACE "org.freedesktop.DBus.ObjectManager"
 
 #define NM_BLUEZ5_ADAPTER_INTERFACE "org.bluez.Adapter1"
 #define NM_BLUEZ5_DEVICE_INTERFACE  "org.bluez.Device1"

src/devices/bluetooth/nm-bluez5-manager.c

@@ -15,6 +15,7 @@
 
 #include "nm-core-internal.h"
 
+#include "nm-std-aux/nm-dbus-compat.h"
 #include "c-list/src/c-list.h"
 #include "nm-bluez-device.h"
 #include "nm-bluez-common.h"
@@ -469,7 +470,7 @@ bluez_connect (NMBluez5Manager *self)
 	                          NULL,
 	                          NM_BLUEZ_SERVICE,
 	                          NM_BLUEZ_MANAGER_PATH,
-	                          NM_OBJECT_MANAGER_INTERFACE,
+	                          DBUS_INTERFACE_OBJECT_MANAGER,
 	                          NULL,
 	                          (GAsyncReadyCallback) on_proxy_acquired,
 	                          self);

src/nm-dbus-manager.c

@@ -1449,7 +1449,7 @@ static const GDBusSignalInfo signal_info_objmgr_interfaces_removed = NM_DEFINE_G
 );
 
 static const GDBusInterfaceInfo interface_info_objmgr = NM_DEFINE_GDBUS_INTERFACE_INFO_INIT (
-	"org.freedesktop.DBus.ObjectManager",
+	DBUS_INTERFACE_OBJECT_MANAGER,
 	.methods = NM_DEFINE_GDBUS_METHOD_INFOS (
 		NM_DEFINE_GDBUS_METHOD_INFO (
 			"GetManagedObjects",