LU-1330 obdecho: splits metadata echo client from client-side

LU-1330 obdecho: splits metadata echo client from client-side

Client-side module needs not to support MDS echo client. Comment out
(using HAVE_SERVER_SUPPORT) it to facilitate obdclass' split/cleanup.

Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
Change-Id: Ie70d9a9bd665878d4ce7327c288fb55abd60c878
Reviewed-on: http://review.whamcloud.com/2674
Tested-by: Jenkins
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>