Complete net-show/net-list/subnet-list/subnet-show

Change-Id: I0047c14eee758c1a283cdc53757544c45994faf3

Defect - replace self allocation_pool calculation with ipaddress - ip_network call

Change-Id: I0c131a65e884ac48646f8c2602d33e53d1316d83
Merge pull request #117 from ajiang38740/net-subnet-list-show-improvement

Complete net-show/net-list/subnet-list/subnet-show