[net_ctl] First cut net_ctl commandline tool

- Create net_ctl bianry
- Implement the following commands
  $net_ctl if list
  $net_ctl if get <iface>
  Or
  $run fuchsia-pkg://fuchsia.com/net_ctl#meta/net_ctl.cmx if list
  $run fuchsia-pkg://fuchsia.com/net_ctl#meta/net_ctl.cmx if get <iface>

Test: CQ
Change-Id: I7eeed7364029a1d2c910af67ffbfcf7050bfdd03
6 files changed