Parse iscsiadm output with and without the recently introduced
flashnode info. [1]

This should check that commits like 57e17a74 (fixing [2]) do
not break iscsiadm output parsing.

[1] https://github.com/mikechristie/open-iscsi/commit/181af9a
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1067173