Docs have incorrect sizing recommendations for logs

[Randy DeFauw]

This document (http://docs.openstack.org/developer/fuel-docs/userdocs/fuel-install-guide/sysreq/sysreq_fuel_master_node_hw_requirements.html) recommends 20 GB of log space per node. In the example, they use 10 nodes so you end up with 200 GB for /var/log.

However, the example then says that the total drive should be 500 GB, as if /var/log was only 40% of the disk.

In reality I believe /var/log is 60% of the disk based on https://github.com/openstack/fuel-main/blob/master/iso/ks.template#L244-L249.

So the disk would really be (200 GB * 5/3) = 333 GB.