plugin: Explicit assign plugin hooks

So it won't depend on the order in declaration.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/criu-plugin.h

@@ -39,16 +39,16 @@
  * Plugin hook points and their arguments in hooks.
  */
 enum {
-	CR_PLUGIN_HOOK__DUMP_UNIX_SK,
-	CR_PLUGIN_HOOK__RESTORE_UNIX_SK,
+	CR_PLUGIN_HOOK__DUMP_UNIX_SK		= 0,
+	CR_PLUGIN_HOOK__RESTORE_UNIX_SK		= 1,
 
-	CR_PLUGIN_HOOK__DUMP_EXT_FILE,
-	CR_PLUGIN_HOOK__RESTORE_EXT_FILE,
+	CR_PLUGIN_HOOK__DUMP_EXT_FILE		= 2,
+	CR_PLUGIN_HOOK__RESTORE_EXT_FILE	= 3,
 
-	CR_PLUGIN_HOOK__DUMP_EXT_MOUNT,
-	CR_PLUGIN_HOOK__RESTORE_EXT_MOUNT,
+	CR_PLUGIN_HOOK__DUMP_EXT_MOUNT		= 4,
+	CR_PLUGIN_HOOK__RESTORE_EXT_MOUNT	= 5,
 
-	CR_PLUGIN_HOOK__DUMP_EXT_LINK,
+	CR_PLUGIN_HOOK__DUMP_EXT_LINK		= 6,
 
 	CR_PLUGIN_HOOK__MAX
 };