Add config file example for cache settings.
Add config file example for cache settings.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

berrange/gerrymander,agx/gerrymander,Dacelonid/gerrymander,agx/gerrymander,Dacelonid/gerrymander,berrange/gerrymander