Fix python3 compat issues in oz-cleanup-cache.
Fix python3 compat issues in oz-cleanup-cache.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

nullr0ute/oz,nullr0ute/oz,clalancette/oz,clalancette/oz