[network] Enable resolvconf service

When resolv.conf contained "search" keyword with no arguments
host/nslookup/dig utilities failed to parse it correctly.
This happens on systems with disabled resolvconf service and
gateway defined on any interface.

Change-Id: I6b95d038562eb457a856bba6104b7dbf9cc97d52
Closes-Bug: PROD-25927
6 files changed