LU-3190 mdd: not return linkEA for dead obj

LU-3190 mdd: not return linkEA for dead obj

1. Not return linkEA for dead object.
2. Check lma_self_fid to match object FID after get
real LMA from the object.
3. clear oi cache during oi delete.
4. correct error value if ldlm_handle_enqueue return
some value other than ldlm_err_t(for example -ESTALE).

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I1d2345eb01ff58584ffba31f86bb408396780aeb
Reviewed-on: http://review.whamcloud.com/6252
Tested-by: Hudson
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>