Do not force default hostname `moby`.
Do not force default hostname `moby`.

This disables the code in LinuxKit's `/bin/rc.init` which attempts to detect an
unconfigured hostname and generate a unique (ish) version from the MAC address.

Anyone who wants a specific fallback hostname can populate `etc/hostname`
through the `files` stanza in their `yml` file.

Signed-off-by: Ian Campbell <9be92b3dbbd6611e3e4c9209fb3d04b4919e7cca@docker.com>

linuxkit/linuxkit,justincormack/linuxkit,rn/linuxkit,linuxkit/linuxkit,justincormack/linuxkit,furious-luke/linuxkit,deitch/linuxkit,JohnnyLeone/linuxkit,JohnnyLeone/linuxkit,furious-luke/linuxkit,justincormack/linuxkit,JohnnyLeone/linuxkit,djs55/linuxkit,yankcrime/linuxkit,YuPengZTE/linuxkit,konstruktoid/linuxkit,yankcrime/linuxkit,konstruktoid/linuxkit,linuxkit/linuxkit,djs55/linuxkit,rn/linuxkit,djs55/linuxkit,linuxkit/linuxkit,YuPengZTE/linuxkit,konstruktoid/linuxkit,deitch/linuxkit,yankcrime/linuxkit,YuPengZTE/linuxkit,justincormack/linuxkit,linuxkit/linuxkit,deitch/linuxkit,konstruktoid/linuxkit,rn/linuxkit,konstruktoid/linuxkit,justincormack/linuxkit,deitch/linuxkit,JohnnyLeone/linuxkit,davefreitag/tool,YuPengZTE/linuxkit,yankcrime/linuxkit,justincormack/linuxkit,konstruktoid/linuxkit,furious-luke/linuxkit,djs55/linuxkit,furious-luke/linuxkit,furious-luke/linuxkit,rn/linuxkit,YuPengZTE/linuxkit,djs55/linuxkit,YuPengZTE/linuxkit,deitch/linuxkit,yankcrime/linuxkit,yankcrime/linuxkit,justincormack/tool,JohnnyLeone/linuxkit,rn/linuxkit