nvme: zero request->submit_tick in allocation

Request may be submitted several times via nvme_qpair_submit_request
function, such as request in queued_req queue being re-submitted.

With enabling timeout feature, nvme_qpair_submit_request compares
request->submit_tick to zero to check if this is the first submission
for this request. If true, record submit_tick for this reuqest.

So request->submit_tick needs to be set zero in allocation.

Signed-off-by: lorneli <lorneli@163.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/456328 (master)

(cherry picked from commit a5dfbc4daf)
Change-Id: Ie3f420aa337802c5ad3962c3fdcd680dec1ccdcb
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/457290
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

lib/nvme/nvme_internal.h

@@ -881,6 +881,7 @@ nvme_allocate_request(struct spdk_nvme_qpair *qpair,
 	req->payload_size = payload_size;
 	req->qpair = qpair;
 	req->pid = g_spdk_nvme_pid;
+	req->submit_tick = 0;
 
 	return req;
 }