Fixes a regression in 3d00522dd3 that caused systemd stopping to
not work.
Previously the flow was to use `GetUnit` and `StopUnit` on the manager
interface. In that code this was switched over it should have been
using the unit interface + `Stop` or manager interface + `StopUnit`
not try to use the manager interface on the unit proxy with `StopUnit`.
All of these messages continually output are just noise for unsupported
devices:
```
18:11:52:0851 FuPlugin using generic udev_device_added() on optionrom
18:11:52:0851 FuEngine optionrom ignoring: no FWUPD_GUID property
```
Actually trying to instantiate the object leads to:
Specified class size for type 'FuWacomEmrDevice' is smaller than the
parent type's 'FuWacomDevice' class size.
Fixes https://github.com/fwupd/fwupd/issues/1456
This was a new file format to help out an OEM, but they didn't actually use it.
If we do need it in the future, it would some back as a src/ helper, not in
plugins/dfu.
We don't support any hardware that actually uses this proposed standard, and
nowadays there is much better public-key encryption people can easily use.
Use this attribute to determine whether or not to try to read 'native'
from the Thunderbolt NVM image at probe time.
This attribute is new to kernel 5.5.
The new plugin is called `optionrom` as this is the only type of image that it
parses for verification only. FuUdevDevice is also the generic parent already.
Although they can be useful for debugging the codepath leading to
a problem, they are also confusing when it comes to the end user
messages:
```
{error #0} linux.c:406 device_get(): readlink of /sys/block/nvme0n1/device/driver failed: No such file or directory
{error #1} linux.c:406 device_get(): readlink of /sys/block/nvme0n1/device/driver failed: No such file or directory
{error #2} linux.c:406 device_get(): readlink of /sys/block/nvme0n1/device/driver failed: No such file or directory
{error #3} linux.c:406 device_get(): readlink of /sys/block/nvme0n1/device/driver failed: No such file or directory:
Error writing to file descriptor: No space left on device
```
Whereas if they weren't shown, that last message would have been plenty.
```
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Upload report now? (Requires internet connection):
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1
key ReportUri not supported
```
