Backport mirage-tcpip "Use Logs library for logging"
Backport mirage-tcpip "Use Logs library for logging"

Also known as 879b0fc68d2d44f5c6317f033ac50ffcc3d4277f

The backport is here:

https://github.com/djs55/mirage-tcpip/commit/0da78c96ab359252e473cd3c9e039680c6fb462e

In particular this avoids `Console.log_s` which won't work if we're using
`libuv` (or anything other than `Lwt_main.run` and `Lwt_unix`)

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,djs55/vpnkit