netd: recognize NDK type in ndc network api

ndc network command now accepts strings describing net_handle_t.
For e.g. ndc network create handle42966108894

Test: manual
Bug: 36682246
CRs-fixed: 2070022
Merged-In: I9e984bf13bd2d37feb80e4c205c0145a3f17cdae
Merged-In: I5ce1f13ffc63557b02da3f3218e6dde59ea2f4d6
Merged-In: I42ce3e922dbeebc05a92e14c471f97e7f1225db7
Merged-In: I030638ce1f069b8cf30b99528ecd5fc80f29e0c2
Merged-In: I9013f346072684f3c57427cd4ffb380e2cdb756b
Merged-In: Ib0adbeace5ca0b790767fff00a340fe81a013d75
Change-Id: I44857af3d82ea408ae429f9fe16fcf5c876851ae
(cherry picked from commit 4c18bd91)