Reduce monitoring nu

Until a better monitoring is found, reduce the load on mysql.
Added DNS records for the hypervisor float interface
Fixed white space
Merge pull request #102 from caiush/float_dns_records

Float dns records
Merge pull request #101 from caiush/zabbix_update_freq

Reduce monitoring freq and metric retention
Remove per-tenancy NS records. Closes #108.
Merge pull request #109 from dspadea/ghi108_remove_extra_ns_records

Remove per-tenancy NS records.
include new key used for flunetd package signing