LU-1214 quota: don't compile quota module for client

LU-1214 quota: don't compile quota module for client

1. Only and always compile lquota module for server, and needs not
   compile quota library for liblustre.
2. HAVE_QUOTA_SUPPORT macro is no more needed in quota source files
3. Removes several un-used function declarations in quota_internal.h

Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Change-Id: Ibf94ba6f37b43721cc53c2d7bde017b039581bbd
Reviewed-on: http://review.whamcloud.com/2363
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>