Description of configuration options for vpn

Configuration option=Default value	Description
config_base_dir=$state_path/ipsec	(StrOpt) Location to store ipsec server config files
ipsec_config_template=/usr/lib/python2.7/site-packages/neutron/services/vpn/device_drivers/template/openswan/ipsec.conf.template	(StrOpt) Template file for ipsec configuration
ipsec_secret_template=/usr/lib/python2.7/site-packages/neutron/services/vpn/device_drivers/template/openswan/ipsec.secret.template	(StrOpt) Template file for ipsec secret configuration
ipsec_status_check_interval=60	(IntOpt) Interval for checking ipsec status
vpn_device_driver=['neutron.services.vpn.device_drivers.ipsec.OpenSwanDriver']	(MultiStrOpt) The vpn device drivers Neutron will use