Skip children in fixupAppData() when parent shady.

If we find a directory with a shady GID, skip traversing into child
directories (if any), since we'll probably end up spamming the log
with every single item inside.

(cherry picked from commit 6b63b91f)

Test: builds, boots
Bug: 65852352
Merged-In: I8f03864adef572fc277e34e9f1589d9664fc75b3
Change-Id: I8f03864adef572fc277e34e9f1589d9664fc75b3