Allow plugin execution order to be defined

This patch adds support for assigning a precedence to each plugin.
This precedence value is used to determine what order the plugins
should be called in within a given plugin type.

The precedence value is an integer between 1 and 99.  The value is
set in the nsslapd-pluginPrecedence attribute in a plugin config
entry in "cn=config".  If a plugin does not have a precedence
value set, the plugin is treated as if it has a precedence of 50.

For more details, see the feature design document at:

    http://directory.fedoraproject.org/wiki/Plugin_Ordering

I also removed an incorrect log message in the linked attrs plugin
that I noticed while debugging this patch.

1 files changed, 0 insertions, 4 deletions

diff --git a/ldap/servers/plugins/linkedattrs/linked_attrs.c b/ldap/servers/plugins/linkedattrs/linked_attrs.c
index a04fbb04..edaf5db1 100644
--- a/ldap/servers/plugins/linkedattrs/linked_attrs.c
+++ b/ldap/servers/plugins/linkedattrs/linked_attrs.c
@@ -1582,10 +1582,6 @@ linked_attrs_mod_post_op(Slapi_PBlock *pb)
         /* First check if the config is being modified. */
         if (linked_attrs_dn_is_config(dn)) {
             linked_attrs_load_config();
-        } else {
-            slapi_log_error(SLAPI_LOG_PLUGIN, LINK_PLUGIN_SUBSYSTEM,
-                            "linked_attrs_mod_post_op: Error "
-                            "retrieving dn\n");
         }
 
         /* get the mod set */