restore: remove gerrit cache and index
restore: remove gerrit cache and index

This change tries to fix the current CI failure on backup restore test.

Change-Id: I8187caaf981b16e019a57cdd6dfc0c140547b68d

enovance/software-factory,enovance/software-factory,enovance/software-factory,enovance/software-factory,enovance/software-factory