set power mode with set feature should support character device

[kwzhu123]

1
/src/autoval_ssd/lib/utils/storage/nvme/nvme_drive.py
def set_power_mode(self, feature_value: int) -> int:
"""Set Power Mode.

    This method sets the value of the power mode using
    the power management feature of the drive.

    Returns
    -------
    feature_value : String
        Set feature value that gives current power-mode of
        the drive. Eg: "5".

    Raises
    ------
    TestError
        - When fails to set the power mode.
        - When fails to match the set-feature output with the
          given pattern.
    NotImplementedError
        - When the power mode is not supported by the drive.
    """

    cmd = "nvme set-feature /dev/%s -f 0x2 -v %s" % (
        self.block_name,
        feature_value,
    )

2
some vendor's drive used character device instead of block device for drive level feature(like Scaleflux /MEMBLAZE)
sudo nvme set-feature /dev/nvme0n1 -f 0x2 --value=0 #should be /dev/nvme0
NVMe status: Feature Not Namespace Specific: The Feature Identifier specified is not namespace specific(0x10f)]

[aarthi-manivel]

@kwzhu123 , The changes for the latest nvmecli version addresses the issues mentioned here and could you please retrigger the test with the latest codebase and let me know if you face issues.