LU-4811 mdt: remove eadatasize check in xattr packing

LU-4811 mdt: remove eadatasize check in xattr packing

Remove client eadatasize check in mdt xattr packing because
client can handle -EOVERFLOW.

Originally part of Lustre-change: http://review.whamcloud.com/6339

Test-Parameters: clientjob=lustre-master clientbuildno=1963
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I47536fa0926804630315e5b78da852f6239497fd
Reviewed-on: http://review.whamcloud.com/9812
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>