Description of DNS configuration options

Configuration option = Default value	Description
[DEFAULT]
dns_account_id =	(StrOpt) Tenant ID for DNSaaS.
dns_auth_url =	(StrOpt) Authentication URL for DNSaaS.
dns_domain_id =	(StrOpt) Domain ID used for adding DNS entries.
dns_domain_name =	(StrOpt) Domain name used for adding DNS entries.
dns_driver = trove.dns.driver.DnsDriver	(StrOpt) Driver for DNSaaS.
dns_endpoint_url = 0.0.0.0	(StrOpt) Endpoint URL for DNSaaS.
dns_hostname =	(StrOpt) Hostname used for adding DNS entries.
dns_instance_entry_factory = trove.dns.driver.DnsInstanceEntryFactory	(StrOpt) Factory for adding DNS entries.
dns_management_base_url =	(StrOpt) Management URL for DNSaaS.
dns_passkey =	(StrOpt) Passkey for DNSaaS.
dns_region =	(StrOpt) Region name for DNSaaS.
dns_service_type =	(StrOpt) Service Type for DNSaaS.
dns_time_out = 120	(IntOpt) Maximum time (in seconds) to wait for a DNS entry add.
dns_ttl = 300	(IntOpt) Time (in seconds) before a refresh of DNS information occurs.
dns_username =	(StrOpt) Username for DNSaaS.
trove_dns_support = False	(BoolOpt) Whether Trove should add DNS entries on create (using Designate DNSaaS).