cc 1.3 importing qti from inside manifest

also fix a couple other minor cc issues

test plan:
* import the test packages referenced in the ticket

* should reference the images correctly in the first package
* should import a quiz in the second

fixes #CNVS-13340

Change-Id: I39dca77953d2b46703fa5163240329b039075ec3
Reviewed-on: https://gerrit.instructure.com/35815
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>