If somehow '127.0.0.1' from 'dnsmasq' got into the list of nameservers
in '/etc/resolv.conf', filter it out of the list of advertised
nameservers to avoid confusion.
- 'dhcpd_global_options' text block has been split into individual
variables;
- if list of nameservers is not specified, debops.dhcpd role will
advertise nameservers set in '/etc/resolv.conf' file;
- default set of options can be enabled or disabled using a bool
variable 'dhcpd_auto_options'. The options have been moved to
a separate configuration template included in main one;
This patch renames all role directories from 'ginas.' to 'debops.'
prefix, no other changes should be expected. Some script names are also
changed, but that shouldn't affect normal operations.
