Missing detailed printing information when exec_sudo fails

[luweijun]

This patch tries to add more detailed info by appending error output to exec_sudo print.

In current implementation, only a simple static note `Exception: exec_sudo failed` is printed:
```
INFO diskimage_builder.block_device.utils [-] Calling [sudo sgdisk /tmp/dib_image.jZaDPxtX/image0.raw -n 1:0:+550M -t 1:EF00 -c 1:ESP -n 2:0:+8M -t 2:EF02 -c 2:BSP -n 3:0:+2077M -t 3:8300 -c 3:root]
ERROR diskimage_builder.block_device.blockdevice [-] Create failed; rollback initiated
// ... ...
diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed
```

but the root reason is missing. We can’t get more error info to make sure what the real root reason even a simple problem like `command not found`, we have to reproduce locally and manually.

After this patch, the error message like:
```
INFO diskimage_builder.block_device.utils [-] Calling [sudo sgdisk /tmp/dib_image.jZaDPxtX/image0.raw -n 1:0:+550M -t 1:EF00 -c 1:ESP -n 2:0:+8M -t 2:EF02 -c 2:BSP -n 3:0:+2077M -t 3:8300 -c 3:root]
ERROR diskimage_builder.block_device.blockdevice [-] Create failed; rollback initiated
// ... ...
diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed: sudo: sgdisk: command not found
```
It's easy to find the real problem and solve it.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/diskimage-builder/+/886908
Committed: https://opendev.org/openstack/diskimage-builder/commit/864ae115091964a4648667bc72e2c5d8f41effae
Submitter: "Zuul (22348)"
Branch: master

commit 864ae115091964a4648667bc72e2c5d8f41effae
Author: wjunlu <email address hidden>
Date: Sun Jun 25 15:20:37 2023 +0800

    Append detailed printing information when exec_sudo fails

    This patch tries to add more detailed info by appending
    error output to exec_sudo print.

    In current implementation, only a simple static note `Exception:
    exec_sudo failed` is printed:
    ```
    INFO diskimage_builder.block_device.utils [-] Calling [sudo sgdisk
     /tmp/dib_image.jZaDPxtX/image0.raw -n 1:0:+550M -t 1:EF00 -c 1:ESP
     -n 2:0:+8M -t 2:EF02 -c 2:BSP -n 3:0:+2077M -t 3:8300 -c 3:root]
    ERROR diskimage_builder.block_device.blockdevice [-] Create failed;
     rollback initiated
    // ... ...
    diskimage_builder.block_device.exception.BlockDeviceSetupException:
     exec_sudo failed
    ```

    but the root reason is missing. We can’t get more error info to
    make sure what the real root reason even a simple problem like
    `command not found`, we have to reproduce locally and manually.

    After this patch, the error message like:
    ```
    INFO diskimage_builder.block_device.utils [-] Calling [sudo sgdisk
     /tmp/dib_image.jZaDPxtX/image0.raw -n 1:0:+550M -t 1:EF00 -c 1:ESP
     -n 2:0:+8M -t 2:EF02 -c 2:BSP -n 3:0:+2077M -t 3:8300 -c 3:root]
    ERROR diskimage_builder.block_device.blockdevice [-] Create failed;
     rollback initiated
    // ... ...
    diskimage_builder.block_device.exception.BlockDeviceSetupException:
     exec_sudo failed: sudo: sgdisk: command not found
    ```
    We can easily find the real problem and solve it.

    Closes-Bug: #2024980

    Change-Id: I9efcd9cb6621e6403df6de14f122b1cf371bd800