Support manually providing a private IPv4 address for an internal network load balancer

[arnogeurts]

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Closes #12329

Release note for CHANGELOG:

resource/aws_lb: Add optional `private_ipv4_address` argument to the `subnet_mappings` block

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSLB_networkLoadbalancerPrivateIPv4Address'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSLB_networkLoadbalancerPrivateIPv4Address -timeout 120m
=== RUN   TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
=== PAUSE TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
=== CONT  TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
--- PASS: TestAccAWSLB_networkLoadbalancerPrivateIPv4Address (235.16s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	235.228s

[ewbankkit]

Closes #11044.
Closes #11887.
Closes #11403.
Closes #11674.

Similar: #11404.

Related: #2901, #11000.

[ewbankkit]

Verified acceptance test:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSLB_networkLoadbalancerPrivateIPv4Address'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws/ -v -count 1 -parallel 20 -run=TestAccAWSLB_networkLoadbalancerPrivateIPv4Address -timeout 120m
=== RUN   TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
=== PAUSE TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
=== CONT  TestAccAWSLB_networkLoadbalancerPrivateIPv4Address
--- PASS: TestAccAWSLB_networkLoadbalancerPrivateIPv4Address (226.32s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	226.349s

[michalmedvecky]

I can happily confirm that it works for me <3

[abohne]

Is there anything we can do to get this merged? I've got some work that is blocked until this functionality is available.

[ericrichtert]

When can this be released, I need this and this will prevent me from using cloudformation.

[DrFaust92]

Hey @arnogeurts, closing this in favor of #11404

[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!