provider/aws: Add support for description to aws_network_interface resource

[stack72]

As requested in #5496

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSENI'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSENI -timeout 120m
=== RUN   TestAccAWSENI_basic
--- PASS: TestAccAWSENI_basic (47.64s)
=== RUN   TestAccAWSENI_updatedDescription
--- PASS: TestAccAWSENI_updatedDescription (82.32s)
=== RUN   TestAccAWSENI_attached
--- PASS: TestAccAWSENI_attached (230.88s)
=== RUN   TestAccAWSENI_ignoreExternalAttachment
--- PASS: TestAccAWSENI_ignoreExternalAttachment (248.85s)
=== RUN   TestAccAWSENI_sourceDestCheck
--- PASS: TestAccAWSENI_sourceDestCheck (37.95s)
=== RUN   TestAccAWSENI_computedIPs
--- PASS: TestAccAWSENI_computedIPs (36.09s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    683.420s

[phinze]

LGTM!

[ghost]

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