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aarch64 does support dmi, but OpenStack does not populate guests
with this information, and there are currently bugs in qemu preventing
it from working correctly see bug #1663304 for more information.
So, for the time being, pretend as if there is no dmi data on aarch64,
which will make it enable cloud-init even when no datasources are found.
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ds-identify is run here from the generator. If ds-identify does
not see any datasources, it can completely disable cloud-init.
The big value in this is that if there is no datasource, no python
will ever be loaded, and cloud-init will be disabled.o
The default policy being added here is:
search,found=all,maybe=all,notfound=disabled
That means:
- enable (in 'datasource_list') all sources that are found.
- if none are found, enable all 'maybe'.
- if no maybe are found, then disable cloud-init.
On platforms without DMI (everything except for aarch64 and x86),
the default 'notfound' setting is 'enabled'. This is because many of
the detection mechanisms rely on dmi data, which is present only on
x86 and aarch64.
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