runner: slapproxy use latest cli from slapos.core

slapos/runner/utils.py

@@ -242,8 +242,8 @@ def startProxy(config):
     return
 
   log = os.path.join(config['log_dir'], 'slapproxy.log')
-  Popen([config['slapproxy'], '--log_file', log,
-         config['configuration_file_path']],
+  Popen([config['slapos'], 'proxy', 'start', '--logfile', log,
+         '--cfg', config['configuration_file_path']],
         name='slapproxy',
         stdout=None)
   time.sleep(4)