[merge] allow for testing multiple Inventory implementations

[Martin Pool]

This reorganizes the Inventory tests to allow us to add and then test a
new better Inventory class.  It also moves two tests for is_inside_any
and is_inside_or_parent_of_any into test_osutils, because they're
osutils functions and apparently not strongly related to the inventory.

At the moment these are only tested for our current Inventory class.

This builds on the previous patch to add a simpler test scenario
interface.

-- 
Martin
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 20070821-inv-test-separation.diff
Type: text/x-diff
Size: 22623 bytes
Desc: not available
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20070821/8abafeda/attachment-0001.bin