LU-5152 quota: disable sync chgrp to OSTs

LU-5152 quota: disable sync chgrp to OSTs

The syschronous chgrp to OSTs introduced by the previous patch
(the commit is 8a71fd5061bd073e055e6cbba1d238305e6827bb) causes
deadlock between MDT and OST, this patch disable it for now and
leave the updated patch to fix it.

Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Change-Id: I5ce48424f4d2011ce62e69047ace7f0b7c3ebbe5
Reviewed-on: https://review.whamcloud.com/33705
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>