WIP (do not merge) - Script to fix ips in a subnet

 - use argparse for config options and help
 - allow fixing of gaps
 - finish out subnets with --complete-subnet
 - allow running against specific cell with --segement-id
   (i.e., ... --segment-id dfw-b0009)
 - allow running against specific subnet with --subnet-id
 - --show-ips will show you the CIDRs of all IPs that
   need to be inserted into each subnet
 - sends email if ip_to_inserts is > 0 and --email is used

RM10859