do not warn for missing gateway IPs
do not warn for missing gateway IPs

When using a /32 address with a point-to-point gateway, you can either
use iproute2's peer option in which case ohai detects the ipaddress
correctly. Alternatively one can configure the /32 address on the
network and setup a static route to the gateway:

$ ip a
3: lxc0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 00:1e:8c:f4:f0:b1 brd ff:ff:ff:ff:ff:ff
    inet 1.2.3.4/32 scope global lxc0

$ ip r
default via 5.9.41.225 dev lxc0
5.9.41.225 dev lxc0  scope link

Using this configuration ohai does the right thing but logs a warning.
This patch simply converts the log line to debug to hide this.

adamleff/ohai,adamleff/ohai,tas50/ohai-1,nathwill/ohai,jaymzh/ohai,phreakocious/ohai,n-marton/ohai,numericillustration/ohai,jseely/ohai,bougyman/ohai,mattray/ohai,johnbellone/ohai,375gnu/ohai,criteo-forks/ohai,jseely/ohai,higanworks/ohai,criteo-forks/ohai,higanworks/ohai,Juniper/ohai,sh9189/ohai,shtzr840329/ohai,sh9189/ohai,btm/ohai,jaymzh/ohai,zshuo/ohai,acaiafa/ohai,Fodoj/ohai,davide125/ohai,tas50/ohai-1,johnbellone/ohai,dreamnite/ohai,nathwill/ohai,mattray/ohai,juliandunn/ohai,jbfavre/ohai,http-418/ohai,chef/ohai,Juniper/ohai,cmluciano/ohai,bougyman/ohai,zshuo/ohai,juliandunn/ohai,numericillustration/ohai,phreakocious/ohai,cmluciano/ohai,shtzr840329/ohai,375gnu/ohai,chef/ohai,davide125/ohai,dreamnite/ohai,jbfavre/ohai,glennmatthews/ohai,acaiafa/ohai,n-marton/ohai,btm/ohai,glennmatthews/ohai,http-418/ohai,Fodoj/ohai