LU-1187 lod: prepare default stripe EA for remote directory

LU-1187 lod: prepare default stripe EA for remote directory

During remote directory create, it should prepare the default
stripe EA in declare, so the default EA can be set correctly
on the remote directory.

Change-Id: Ief93e72cc033f3553865f2abba53e81df0f3fa89
Signed-off-by: Wang Di <di.wang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/4335
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>