drop zc.buildout version pinning in reboot() to prevent loop in case of version change.

slapos/rebootstrap/__init__.py

@@ -68,6 +68,8 @@ Buildout will be restarted automatically to have this change applied.
     running_python=self.running_python)
     self.logger.info(message)
     args = map(zc.buildout.easy_install._safe_arg, sys.argv)
+    # drop zc.buildout version to prevent loop in case of version change
+    args = [x for x in args if not x.startswith('versions:zc.buildout=')]
     env = os.environ
     if 'ORIG_PYTHON' not in env:
       env['ORIG_PYTHON'] = sys.executable