Unable to attach/ activate export domain in Red Hat Enterprise Virtualization 3.5

Issue

• Why it is not possible to attach export domain in Red Hat Enterprise Virtualization 3.5?
• Adding the domain fails with following error on the host /var/log/vdsm/vdsm.log:

 Thread-50454::ERROR::2016-01-07 14:07:13,067::storageServer::213::Storage.StorageServer.MountConnection::(connect) Mount failed: (32, ';Job for rpc-statd.service failed because the control process exited with error code. See "systemctl status rpc-statd.service" and "journalctl -xe" for details.\nmount.nfs: rpc.statd is not running but is required for remote locking.\nmount.nfs: Either use \'-o nolock\' to keep locks local, or start statd.\nmount.nfs: an incorrect mount option was specified\n')
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/storageServer.py", line 211, in connect
    self._mount.mount(self.options, self._vfsType)
  File "/usr/share/vdsm/storage/mount.py", line 223, in mount
    return self._runcmd(cmd, timeout)
  File "/usr/share/vdsm/storage/mount.py", line 239, in _runcmd
    raise MountError(rc, ";".join((out, err)))