ClatdController - create tun file descriptor and pass it to clatd

Test: in progress
Bug: 65674744
Bug: 131268436
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I77d4636fb7aca46f4964208a6c44c46dd7eabb48
Merged-In: I77d4636fb7aca46f4964208a6c44c46dd7eabb48
(cherry picked from commit f4b44fed764ca5b2ed9e99b700084a4387ba7ed6)
2 files changed