aws_prefix_list data source - Add ability to select PL by name

[ewbankkit]

Add the ability to select a prefix list by name instead of/as well as by name.
I decided not to call the attribute prefix_list_name as we already have a name attribute, which I reused.
I wish I had done the same with the id attribute when I added this data source but I know now 😄.
Updated the documentation and acceptance tests:

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccDataSourceAwsPrefixList'

[stack72]

Hi @ewbankkit

Thanks for the work here - this is a good addition :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccDataSourceAwsPrefixList'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/11/20 16:20:42 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccDataSourceAwsPrefixList -timeout 120m
=== RUN   TestAccDataSourceAwsPrefixList
--- PASS: TestAccDataSourceAwsPrefixList (16.98s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    17.005s

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