qtest/ide: Uninitialize PC allocator

Use the new call to pc_alloc_uninit
as a test for the new pathways.

The leak checking / assert pathways are
not enabled in this patch, leaving this
as an option to future test writers.

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
