LU-1632 fid: remove fid_delete in delete_inode procedure

LU-1632 fid: remove fid_delete in delete_inode procedure

Remove fid_delete in delete_inode procedure, which is
completely obsolete in 2.x infrastructure , especially
when lmv layer is not being created during upgrade,
because it will cause the client fid space to be zero
out whenever an inode is being deleted.

Signed-off-by: Wang Di <di.wang@whamcloud.com>
Change-Id: I07a59da0db2ac284eb99f78a24b0e1af3080e2ca
Reviewed-on: http://review.whamcloud.com/3422
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>