multipath extend volume not working on running VM randomly

[Sang Tran]

Environment:
- iSCSI storage with multipath.
- High load compute host with hundred of LUN attached.

Step to reproduce this bug:
1. Extend volume from horizon.
2. The action log from portal show the volume extended successfully
3. Check the lsblk on VM OS but the corresponding device was not updated size correctly

Check the bug from nova-compute shown error as below:

2021-07-07 11:04:41.760 7 ERROR oslo_messaging.rpc.server oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
2021-07-07 11:04:41.760 7 ERROR oslo_messaging.rpc.server Command: multipathd resize map 3600a09803831456c6f5d517433533764
2021-07-07 11:04:41.760 7 ERROR oslo_messaging.rpc.server Exit code: 1
2021-07-07 11:04:41.760 7 ERROR oslo_messaging.rpc.server Stdout: 'timeout receiving packet\n'
2021-07-07 11:04:41.760 7 ERROR oslo_messaging.rpc.server Stderr: ''

Workaround:
- Using the command "virsh blockresize <domain> < device> <new-size>" to update new volume size to VM.