block_meta_v2: don't solely expect flag='logical' for logical partitions
Most of the time, a logical partition has its flag set to 'local'.
However, it some cases, it can also have flag set to 'swap', 'boot' and
possibly other values.
To determine if a partition is actually logical on a DOS partition
table, we need to check the partition number.
block-meta: fix failed disk lookup when WWN includes extension
curtin's storage config extracts the WWN of a disk from one of the
following udev variables:
* ID_WWN_WITH_EXTENSION (preferred)
* ID_WWN
However, when trying to look the disk up later in the block-meta code,
curtin only tries to match the WWN value against the ID_WWN variable
(and another variable related to DM multipath).
This means that the disk can not be be found just based on the wwn if
the ID_WWN and ID_WWN_WITH_EXTENSION variables don't hold the same
value.
In the past, that was often okay because other fields (such as disk path
or serial) would still make the disk lookup succeed.
However, the following patch introduced a restriction. In v2, all fields
specified must now match for the disk lookup to be successful:
8c5f87ed block_meta: all fields on a disk action must match with v2 config
Fixed by matching against the ID_WWN_WITH_EXTENSION (preferred) and then
ID_WWN.
