provider/aws: Add aws_alb_listener data source

[vancluever]

This adds the aws_alb_listener data source to get information on an AWS
Application Load Balancer listener.

The schema is slightly modified (only option-wise, attributes are the
same) and we use the aws_alb_listener resource read function to get the
data.

Note that the HTTPS test here may fail due until
#10180 is merged.

[vancluever]

Just realized I forgot about docs! Will add these ASAP.

[vancluever]

All docs added, this one is good to go!

[stack72]

LGTM! Thanks so much for the follow up commit for the docs - the tests are green too :) Bonus points for the use of errwrap ;)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccDataSourceAWSALBListener_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/11/18 12:55:32 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccDataSourceAWSALBListener_ -timeout 120m
=== RUN   TestAccDataSourceAWSALBListener_basic
--- PASS: TestAccDataSourceAWSALBListener_basic (145.73s)
=== RUN   TestAccDataSourceAWSALBListener_https
--- PASS: TestAccDataSourceAWSALBListener_https (122.15s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    267.902s

[vancluever]

Thank you sir!

[ghost]

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