partition: wait for 1s between mkpart and mklabel

[hs0210]

Sometimes it will fail to mkpart just after mklabel, it says that: "Partition(s) 1 on /dev/sda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use. As a result, the old partition(s) will remain in use. You should reboot now before making further changes."

Wait a little time can fix this problem.

Before:

# /usr/local/bin/avocado run --vt-type libvirt --test-runner=runner --vt-machine-type arm64-mmio svirt_attach_disk.positive_test.disk_pool.disk_seclabel.enable_namespace.disk_label_svirt_image_s0.sec_relabel_yes.sec_type_static --vt-connect-uri qemu:///system
JOB ID     : 9947bb62fcbb04b53c5ec9d770cf8b46716ea2d0
JOB LOG    : /root/avocado/job-results/job-2022-11-11T05.09-9947bb6/job.log
 (1/1) type_specific.io-github-autotest-libvirt.svirt_attach_disk.positive_test.disk_pool.disk_seclabel.enable_namespace.disk_label_svirt_image_s0.sec_relabel_yes.sec_type_static: 
ERROR: Command 'parted -s -a optimal /dev/sdb mkpart primary ext4 0 20.0' failed.\nstdout: b''\nstderr: b'Warning: The resulting partition is not properly aligned for best performance: 1s % 16384s != 0s\n
Error: Partition(s) 1 on /dev/sdb have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.\n (18.80 s)
RESULTS    : PASS 0 | ERROR 1 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /root/avocado/job-results/job-2022-11-11T05.09-9947bb6/results.html
JOB TIME   : 19.15 s

After:

# /usr/local/bin/avocado run --vt-type libvirt --test-runner=runner --vt-machine-type arm64-mmio svirt_attach_disk.positive_test.disk_pool.disk_seclabel.enable_namespace.disk_label_svirt_image_s0.sec_relabel_yes.sec_type_static --vt-connect-uri qemu:///system
JOB ID     : b41b9272fc60d969b91e1d1d1b7e7a33386707f5
JOB LOG    : /root/avocado/job-results/job-2022-11-11T05.13-b41b927/job.log
 (1/1) type_specific.io-github-autotest-libvirt.svirt_attach_disk.positive_test.disk_pool.disk_seclabel.enable_namespace.disk_label_svirt_image_s0.sec_relabel_yes.sec_type_static: PASS (47.24 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /root/avocado/job-results/job-2022-11-11T05.13-b41b927/results.html
JOB TIME   : 47.60 s

Signed-off-by: Hu Shuai [email protected]

[hs0210]

This problem sometimes occurs in aarch64 CI tests, but not when I test manually.
Sleeping for 1 second in CI tests also fixes the issue.

[chunfuwen]

lgtm