dhcp: apply netconfig settings before any other data

bnc#861476 - dhcp: hostname no longer set by default
Merge pull request #154 from kmroz/default-hostname-fix
dhcp: request HOSTNAME and other common options

hostname no longer set by default (bnc#861476)
dhcp: added nds settings to leaseinfo dumps
Merge pull request #155 from mtomaschewski/dhcp-fixes-2

dhcp: request HOSTNAME and other common options
version 0.5.7