Refactor import testing for VPN connections

[ryndaniels]

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Relates #8944

Release note for CHANGELOG:

Output from acceptance testing:

$ make testacc TESTARGS="-run=TestAccAWSVpnConnection"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSVpnConnection -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSVpnConnectionRoute_basic
=== PAUSE TestAccAWSVpnConnectionRoute_basic
=== RUN   TestAccAWSVpnConnection_basic
=== PAUSE TestAccAWSVpnConnection_basic
=== RUN   TestAccAWSVpnConnection_TransitGatewayID
=== PAUSE TestAccAWSVpnConnection_TransitGatewayID
=== RUN   TestAccAWSVpnConnection_tunnelOptions
=== PAUSE TestAccAWSVpnConnection_tunnelOptions
=== RUN   TestAccAWSVpnConnection_withoutStaticRoutes
=== PAUSE TestAccAWSVpnConnection_withoutStaticRoutes
=== RUN   TestAccAWSVpnConnection_disappears
=== PAUSE TestAccAWSVpnConnection_disappears
=== CONT  TestAccAWSVpnConnectionRoute_basic
=== CONT  TestAccAWSVpnConnection_tunnelOptions
=== CONT  TestAccAWSVpnConnection_withoutStaticRoutes
=== CONT  TestAccAWSVpnConnection_TransitGatewayID
=== CONT  TestAccAWSVpnConnection_basic
=== CONT  TestAccAWSVpnConnection_disappears
--- PASS: TestAccAWSVpnConnection_tunnelOptions (261.69s)
--- PASS: TestAccAWSVpnConnection_withoutStaticRoutes (328.83s)
--- PASS: TestAccAWSVpnConnectionRoute_basic (333.00s)
--- PASS: TestAccAWSVpnConnection_disappears (335.03s)
--- PASS: TestAccAWSVpnConnection_basic (754.74s)
--- PASS: TestAccAWSVpnConnection_TransitGatewayID (851.74s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       853.294s

[bflad]

LGTM 🚀

--- PASS: TestAWSVpnConnection_xmlconfig (0.00s)
--- PASS: TestAccAWSVpnConnection_disappears (200.39s)
--- PASS: TestAccAWSVpnConnection_tunnelOptions (273.76s)
--- PASS: TestAccAWSVpnConnectionRoute_basic (277.46s)
--- PASS: TestAccAWSVpnConnection_withoutStaticRoutes (302.26s)
--- PASS: TestAccAWSVpnConnection_TransitGatewayID (745.37s)
--- PASS: TestAccAWSVpnConnection_basic (786.44s)

[ghost]

This has been released in version 2.30.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!