Use dnsmasq to reduce system hangs on dns-server downtime

We would like to use reduce system hangs on dns-server by using dnsmasq
as dns cache server. This was reported and tracked in bnc#901497
Bind named service to admin network ip address
Tune Time-To-Live for DNS records, ttl=300s
Fix indentations and formating in named.conf file
Merge pull request #108 from mjura/bnc901497

Use dnsmasq to reduce system hangs on dns-server downtime