Bosh::Aws::Rds#security_group_exists?
Bosh::Aws::Rds#create_security_group
add cidrip to rds create_security_group
plumb vpc id and cidr into create rds
create db security group if it doesn't exist
assign db security group to rds instances
wait for db instances to be deleted
Bosh::Aws::RDS#subnet_group_names
Bosh::Aws::RDS#delete_subnet_group
Bosh::Aws::RDS#delete_subnet_groups
Bosh::Aws::RDS#security_group_names
Bosh::Aws::Rds#delete_security_group
Bosh::Aws::RDS#delete_security_groups
Bosh::Cli::Command::AWS#delete_all_rds_subnet_groups
Bosh::Cli::Command::AWS#delete_all_rds_security_groups
delete all rds resources in aws destroy

delete the db subnet groups and db security groups.
bump rds provisioning time to 30 minutes