staging/lustre/seq: remove seq_{query,handle}

This is only part of the original Lustre tree commit. Main part of the
original commit modifies server side code.

Lustre-change: http://review.whamcloud.com/6765
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3467


Signed-off-by: Mikhail Pershin <mike.pershin@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>