LU-11098 ptlrpc: ASSERTION(!list_empty(imp->imp_replay_cursor))

LU-11098 ptlrpc: ASSERTION(!list_empty(imp->imp_replay_cursor))

It's ptlrpc_replay_next() vs close race.
ll_close_inode_openhandle() calls
mdc_free_open()->ptlrpc_request_committed->ptlrpc_free_request

Need to reset imp_replay_cursor while dropping a request from
replay list.

Change-Id: Ia0ce327a729f8cf554b008ab6d32323b5dd26ee7
Cray-bug-id: LUS-2455
Signed-off-by: Andriy Skulysh <c17819@cray.com>
Reviewed-on: https://review.whamcloud.com/32727
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Vladimir Saveliev <c17830@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>