Fix panic when security groups are on EC2-Classic #89
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Fix #88
When security groups are on EC2-Classic, VPC ID is nil.
ref: https://docs.aws.amazon.com/sdk-for-go/api/service/ec2/#SecurityGroup
So, use DescribeAccountAttirbutes API instead of DescribeVpcs API to detect the default VPC. This response is
nonewhen support EC2-Classic platform.