Can not delete cluster when VPC creation failed

[jzhoucliqr]

/kind bug

What steps did you take and what happened:
A cluster creation failed because of VPC quota limit, when try to delete the cluster, it stuck at delete security groups because there is no VPC-ID.

[capa-controller-manager-ccd64cb9-bzs9v] 1 controller.go:257] controller-runtime/controller "msg"="Reconciler error" "error"="error deleting security groups for AWSCluster cluster-6005cc2b93ed23f55890cde8/aws-test-centos-os-patch-01: failed to describe cluster-owned security groups in vpc \"\": InvalidParameterValue: vpc-id\n\tstatus code: 400, request id: dfe92f29-2b56-4aea-9115-c355e38a8d22" "controller"="awscluster" "name"="aws-test-centos-os-patch-01" "namespace"="cluster-6005cc2b93ed23f55890cde8"

We are using capa 0.6.3, but by looking at the code, 0.6.4 should have the same issue.

What did you expect to happen:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api-provider-aws version: 0.6.3
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):