don't over mount on /etc/hostname

[laijs]

don't over mount on /etc/hostname when run container for docker, since docker provides and is keeping updating this file.

Problem1: how to distinguish whether /etc/hostname ?
Problem2: hyperstart should be also notified when hostname need to be updated. hyperstart can also update this /etc/hostname. (So, is this issue a real problem?)

[laijs]

so does /etc/resolv.conf