Always set max_prefixes value to 0 if not defined.
Always set max_prefixes value to 0 if not defined.

When creating a new AS without giving max prefixes values for IPv6 and
IPv4, set these values to 0 when using them in templates. It is easy to
a 0 value in template rather than a None value.

respawner/peering-manager,respawner/peering-manager,respawner/peering-manager,respawner/peering-manager