Network range editor need to handle the four DHCP options

[galthaus]

The network range now supports:
"allow_anon_leases": true,
"allow_bound_leases": false,
"anon_lease_time": 60,
"bound_lease_time": 2.592e+06,

These are used to tell the DHCP server what and how long things should operation. Lease times are in seconds and should not be less that 15 seconds.

[galthaus]

Lease times are only valid if the boolean is true.

[galthaus]

Should also not use floats but it seems to be coming from the core. The spec uses integer seconds.

[galthaus]

Reopen- #342 adds these to networks and they should be added to network range.