Enhancements to source NAT pool IP address range and NAT pool name character length

We've increased the source NAT pool IP address range from 8 IP addresses to 64 IP addresses. We've also increased the configurable length of the source NAT pool name, destination NAT pool name, source NAT rule name, destination NAT rule name, static NAT rule name, and rule set name from 31 characters to 63 characters.