Import test refactor for DX resources

[ryndaniels]

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Relates #8944

Release note for CHANGELOG:

NONE

Output from acceptance testing:

make testacc TESTARGS="-run=TestAccAWSDxConnection_"     
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -count 1 -parallel 20 -run=TestAccAWSDxConnection_ -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSDxConnection_basic
=== PAUSE TestAccAWSDxConnection_basic
=== RUN   TestAccAWSDxConnection_tags
=== PAUSE TestAccAWSDxConnection_tags
=== CONT  TestAccAWSDxConnection_basic
=== CONT  TestAccAWSDxConnection_tags
--- PASS: TestAccAWSDxConnection_basic (40.44s)
--- PASS: TestAccAWSDxConnection_tags (60.99s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       62.422s

make testacc TESTARGS="-run=TestAccAwsDxGateway_"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -count 1 -parallel 20 -run=TestAccAwsDxGateway_ -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAwsDxGateway_basic
=== PAUSE TestAccAwsDxGateway_basic
=== RUN   TestAccAwsDxGateway_complex
=== PAUSE TestAccAwsDxGateway_complex
=== CONT  TestAccAwsDxGateway_basic
=== CONT  TestAccAwsDxGateway_complex
--- PASS: TestAccAwsDxGateway_basic (50.14s)
--- PASS: TestAccAwsDxGateway_complex (1218.72s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       1220.152s

make testacc TESTARGS="-run=TestAccAWSDxLag_"     
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -count 1 -parallel 20 -run=TestAccAWSDxLag_ -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSDxLag_basic
=== PAUSE TestAccAWSDxLag_basic
=== RUN   TestAccAWSDxLag_tags
=== PAUSE TestAccAWSDxLag_tags
=== CONT  TestAccAWSDxLag_basic
=== CONT  TestAccAWSDxLag_tags
--- PASS: TestAccAWSDxLag_basic (62.31s)
--- PASS: TestAccAWSDxLag_tags (82.70s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       84.119s

[bflad]

LGTM

--- PASS: TestAccAWSDxConnectionAssociation_basic (23.84s)
--- PASS: TestAccAWSDxConnection_basic (24.24s)
--- PASS: TestAccAWSDxConnectionAssociation_multiConns (24.95s)
--- PASS: TestAccAWSDxLag_basic (29.12s)
--- PASS: TestAccAWSDxConnection_tags (29.32s)
--- PASS: TestAccAWSDxLag_tags (27.58s)
--- PASS: TestAccAwsDxGateway_basic (98.07s)
--- PASS: TestAccAwsDxGatewayAssociationProposal_VpnGatewayId (106.21s)
--- PASS: TestAccAwsDxGatewayAssociationProposal_disappears (106.48s)
--- PASS: TestAccAwsDxGatewayAssociationProposal_basicVpnGateway (107.17s)
--- PASS: TestAccAwsDxGatewayAssociationProposal_AllowedPrefixes (109.12s)
--- PASS: TestAccAwsDxGatewayAssociationProposal_basicTransitGateway (173.62s)
--- PASS: TestAccAwsDxGatewayAssociation_basicTransitGatewaySingleAccount (1032.72s)
--- PASS: TestAccAwsDxGatewayAssociation_basicTransitGatewayCrossAccount (1037.73s)
--- PASS: TestAccAwsDxGatewayAssociation_basicVpnGatewaySingleAccount (1306.47s)
--- PASS: TestAccAwsDxGateway_complex (1310.98s)
--- PASS: TestAccAwsDxGatewayAssociation_basicVpnGatewayCrossAccount (1313.31s)
--- PASS: TestAccAwsDxGatewayAssociation_deprecatedSingleAccount (1390.75s)
--- PASS: TestAccAwsDxGatewayAssociation_multiVpnGatewaysSingleAccount (1454.09s)
--- PASS: TestAccAwsDxGatewayAssociation_allowedPrefixesVpnGatewayCrossAccount (1652.38s)
--- PASS: TestAccAwsDxGatewayAssociation_allowedPrefixesVpnGatewaySingleAccount (1816.61s)

[ghost]

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