soooo...

turns out ALL of the disk operations can be performed with
gobject-introspection.

BUT it's unlikely that that'll be available everywhere, or that
the Arch Linux releng team would include it, etc.
So we have fallbacks to mimic it.

BUT please try to use gobject-introspection with libblockdev,
because it's going to be a lot faster and a lot less error-prone.

aif/disk/luks_fallback.py

@@ -0,0 +1,9 @@
+import aif.disk.block_fallback as block
+import aif.disk.lvm_fallback as lvm
+import aif.disk.mdadm_fallback as mdadm
+
+
+class LUKS(object):
+    def __init__(self, partobj):
+        self.devpath = None
+        pass