warden: Add static IPs to /etc/hosts; ignore DNS in sshd
warden: Add static IPs to /etc/hosts; ignore DNS in sshd

Change-Id: Ica3990e6f1b09e68a6673ce066a36a43a949c212

cloudfoundry-incubator/garden-linux,tangfeixiong/garden,savaki/garden,cloudfoundry-incubator/garden,shashidharatd/garden-linux,shashidharatd/garden-linux,cloudfoundry-incubator/garden-linux,tsaleh/garden,cloudfoundry-incubator/garden,savaki/garden,cloudfoundry-incubator/garden-linux,shashidharatd/garden-linux,tsaleh/garden,tangfeixiong/garden,shashidharatd/garden-linux