Ambiguous error logs for retype of inspur storage volume

Description
===========
When retyping between two pools within one inspur storage,
some error logs were encountered in cinder-volume service
logs. These logs give users a misconception that the retype
operation failed. The retype operation, however, is succeessful.

Steps to reproduce
==================
1. Provision two pools in the same inspur storage.
2. One is for SAS utilization which complies with sas volume type,
the other is for SSD utilization which complies with ssd volume type..
3. Create a volume based on sas volume type.
4. Retype the sas volume to ssd volume.

Expected result
===============
Retype operation succeed and no erroneous logs appear.

Actual result
=============
Retype operation succeed, but some error logs are encountered in
cinder-volume service logs. And these logs give users a misconception
that the retype operation failed.

Environment
===========
master branch of cinder

Logs & Configs
==============
2021-02-26 08:13:30.398 3584670 DEBUG oslo_concurrency.processutils [req-95998b5b-9855-4c61-8890-8f1f3ee5e486 60dd8e29329f413889865e01a1b8a844 9acf487c542847079e9ad73daa23f3f2 - default default] Running cmd (SSH): mcsop chvdisk -name volume-d2d63835-4afb-4943-9bc1-c6a708b66f41 "volume-fae78c8a-5dc0-48b0-acf5-4a60a3c34204" ssh_execute /var/lib/openstack/lib/python3.6/site-packages/oslo_concurrency/processutils.py:525
2021-02-26 08:13:30.715 3584670 DEBUG oslo_concurrency.processutils [req-95998b5b-9855-4c61-8890-8f1f3ee5e486 60dd8e29329f413889865e01a1b8a844 9acf487c542847079e9ad73daa23f3f2 - default default] Result was 1 ssh_execute /var/lib/openstack/lib/python3.6/site-packages/oslo_concurrency/processutils.py:560
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common [req-95998b5b-9855-4c61-8890-8f1f3ee5e486 60dd8e29329f413889865e01a1b8a844 9acf487c542847079e9ad73daa23f3f2 - default default] Error has occurred: Unexpected error while running command.
Command: mcsop chvdisk -name volume-d2d63835-4afb-4943-9bc1-c6a708b66f41 "volume-fae78c8a-5dc0-48b0-acf5-4a60a3c34204"
Exit code: 1
Stdout: ''
Stderr: 'CMMVC6035E The action failed as the object already exists.\n': oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
Command: mcsop chvdisk -name volume-d2d63835-4afb-4943-9bc1-c6a708b66f41 "volume-fae78c8a-5dc0-48b0-acf5-4a60a3c34204"
Exit code: 1
Stdout: ''
Stderr: 'CMMVC6035E The action failed as the object already exists.\n'
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common Traceback (most recent call last):
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common File "/var/lib/openstack/lib/python3.6/site-packages/cinder/volume/drivers/inspur/instorage/instorage_common.py", line 435, in _ssh_execute
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common check_exit_code=check_exit_code)
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common File "/var/lib/openstack/lib/python3.6/site-packages/oslo_concurrency/processutils.py", line 570, in ssh_execute
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common cmd=sanitized_cmd)
2021-02-26 08:13:30.716 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
2021-02-26 08:13:33.837 3584670 ERROR cinder.volume.drivers.inspur.instorage.instorage_common [req-95998b5b-9855-4c61-8890-8f1f3ee5e486 60dd8e29329f413889865e01a1b8a844 9acf487c542847079e9ad73daa23f3f2 - default default] Unable to rename the logical volume for volume: d2d63835-4afb-4943-9bc1-c6a708b66f41: cinder.exception.VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: CLI Exception output: