provider/aws: Fixes the use of Uppercase chars in ELB Listeners

[stack72]

Fixes #5303 - where the usage of uppercase characters in https / ssl listener said the listener was added when it wasn't. This PR doesn't change the behviour at all - it just changes how we check that we are creating a valid ELB listener config

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSELB' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSELB -timeout 120m
=== RUN   TestAccAWSELB_basic
--- PASS: TestAccAWSELB_basic (30.14s)
=== RUN   TestAccAWSELB_fullCharacterRange
--- PASS: TestAccAWSELB_fullCharacterRange (25.72s)
=== RUN   TestAccAWSELB_AccessLogs
--- PASS: TestAccAWSELB_AccessLogs (74.76s)
=== RUN   TestAccAWSELB_generatedName
--- PASS: TestAccAWSELB_generatedName (22.79s)
=== RUN   TestAccAWSELB_availabilityZones
--- PASS: TestAccAWSELB_availabilityZones (39.87s)
=== RUN   TestAccAWSELB_tags
--- PASS: TestAccAWSELB_tags (42.28s)
=== RUN   TestAccAWSELB_iam_server_cert
--- PASS: TestAccAWSELB_iam_server_cert (33.54s)
=== RUN   TestAccAWSELB_InstanceAttaching
--- PASS: TestAccAWSELB_InstanceAttaching (142.16s)
=== RUN   TestAccAWSELBUpdate_Listener
--- PASS: TestAccAWSELBUpdate_Listener (51.82s)
=== RUN   TestAccAWSELB_HealthCheck
--- PASS: TestAccAWSELB_HealthCheck (26.24s)
=== RUN   TestAccAWSELBUpdate_HealthCheck
--- PASS: TestAccAWSELBUpdate_HealthCheck (50.48s)
=== RUN   TestAccAWSELB_Timeout
--- PASS: TestAccAWSELB_Timeout (38.09s)
=== RUN   TestAccAWSELBUpdate_Timeout
--- PASS: TestAccAWSELBUpdate_Timeout (56.80s)
=== RUN   TestAccAWSELB_ConnectionDraining
--- PASS: TestAccAWSELB_ConnectionDraining (30.56s)
=== RUN   TestAccAWSELBUpdate_ConnectionDraining
--- PASS: TestAccAWSELBUpdate_ConnectionDraining (69.16s)
=== RUN   TestAccAWSELB_SecurityGroups
--- PASS: TestAccAWSELB_SecurityGroups (55.63s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    790.071s

[jen20]

LGTM!

[ghost]

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