SUSE support

Note that this configured bind to use /etc/bind for config, etc. whereas
the default config on SUSE runs chrooted out of /var/lib/named.  It may
be worth considering having Crowbar configure bind this latter way.

Signed-off-by: Tim Serong <tserong@suse.com>
Make sure dns is working when configuring the admin node

On the admin node add the forwarders to resolv.conf until the dns-server role
was applied.
explicitly do not run chrooted (bnc#787344)
Expose nameservers chef attribute to crowbar proposals

Allows to add additional nameserver entries in /etc/resolv.conf already in a
'dns' proposal.
Fix wrong /etc/bind/named.conf template

No need to add empty "forwarders { };" option.
Provide "allow_transfer" proposal / chef attribute

To configure zone transfer in /etc/bind/named.conf
Merge pull request #45 from rhafer/release/pebbles/master

https://github.com/crowbar/barclamp-dns/pull/45

Merged by devtool for VictorLowther