LU-2792 fld: add dot_seq into in_fldb check

LU-2792 fld: add dot_seq into in_fldb check

Add FID_SEQ_DOT_LUSTRE into fid_seq_in_fldb, because the
dot_seq is inserted into fldb cache list in fld_server_init.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I6417bab77d48c9d9c991119b29f3d2ab04e88ef2
Reviewed-on: http://review.whamcloud.com/5318
Tested-by: Hudson
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>