192.0.x.x is non-private addresses. Since we now in some
cases care about the address ranges used in the environment
switch to use addresses in the private space 192.168.x.x.
Also minor update to doc, router addresses are no longer
dynamically allocated.
The top-level network template directories have been copied to the
overcloud-templates directory. The old locations are left for
backwards compatibility, but any existing references to them should
be updated to use the version in overcloud-templates instead.
This creates a new directory called overcloud-templates and adds
v2 versions of the existing ipv4, ipv6, and bond net-iso templates
to it. The existing v1 templates will also be copied to the new
directory and the old top-level directories will be deprecated.
Note that the v2 templates default to the 192.168.24.0/24 CIDR that
is the default in all releases that support v2 net-iso templates.
Otherwise they are configured identically to the v1 templates.