Revert "idmap: Don't log spam "CREATING STRING CACHE""

This reverts commit 8a8b3bc1f7fe97b1c11693ad3350cebfd9e546be.

Change-Id: Ic461c90e9fd50b81051b2bc55bb6507f40144c36
idmap: reduce CREATING STRING CACHE verbosity

Change-Id: I7febe358b3b302427650edc1d00772fc9d2d547c