when stopping wait for real stopping of the daemon

src/ldaptools/slapd.py

@@ -170,9 +170,18 @@ olcAccess: {{0}}to * by manage'''
         assert self.process
 
         process = self.process
-        self.process = None
         process.kill()
 
+        while True:
+            try:
+                conn = self.get_connection()
+                conn.whoami_s()
+            except ldap.SERVER_DOWN:
+                break
+            else:
+                time.sleep(0.1)
+        self.process = None
+
     def checkpoint(self):
         '''Stop slapd and save current data state'''
         assert not self.process