Documentation for backup restore procedure should include steps to create appendonly file in redis components

When setting the redis config back to appendonly yes, redis will not load the rdb file that was copied into the volume, thus making all the restore steps useless.

In order to avoid this, the appendonly file should be created manually before turning it back on.

In other words, between steps 10 and 11 here, there should be the following step:

oc rsh $(oc get pods -l 'deploymentConfig=backend-redis' -o json | jq '.items[0].metadata.name' -r) bash -c 'redis-cli BGREWRITEAOF'