LU-3105 mdt: do not announce support for capabilities

LU-3105 mdt: do not announce support for capabilities

this is not supported yet. we shouldn't confuse the clients.

Change-Id: I9ea203935d90335f8babf5f977e9a8a39158bd70
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: http://review.whamcloud.com/14422
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>