Merge from vendor branch TNF:

Merge from vendor branch TNF:
This is dhcpd-pools ISC dhcp shared network and pool range usage analysis.
Purpose of command is to count usage ratio of each IP range and shared network
pool which ISC dhcpd is in control of. The command has no native monitoring
capability, for instance the tool will not talk nagios protocol. To accomodiate
this need the CSV output format is meant to be parsed by some organization
specific script etc. Users of the command are most likely ISPs and other
organizations that have large IP space.