Don't do any I/O when starting the profile saver

The profile saver is started when the application is launched. During
the start we used to prepare the paths and transform them to canonical
paths to make sure we do the foreign dex checks on the actual paths.

Postpone the canonical path transformation to a later point to make sure
the impact is minimal.

Bug: 28785119
Bug: 28625993
Change-Id: I1aa378cdefde6ed6dc708762392db0f3a3158812