provider/datadog: Add aggregator method to timeboard graph resource

[grubernaut]

Adds aggregator argument to the timeboard graph resource.

Ex:

request {
  q = "top(avg:docker.cpu.system{*} by {container_name}, 10, 'mean', 'desc')"
  aggregator = "sum"
}

$ make testacc TEST=./builtin/providers/datadog TESTARGS='-run=TestAccDatadogTimeboard_update'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/01/13 17:52:50 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/datadog -v -run=TestAccDatadogTimeboard_update -timeout 120m
=== RUN   TestAccDatadogTimeboard_update
--- PASS: TestAccDatadogTimeboard_update (82.60s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/datadog        82.619s

Fixes: #11168

[stack72]

LGTM!

% make testacc TEST=./builtin/providers/datadog                                                                                     127 ↵ ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/01/17 11:57:21 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/datadog -v  -timeout 120m
=== RUN   TestDatadogMonitor_import
--- PASS: TestDatadogMonitor_import (84.65s)
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccDatadogMonitor_Basic
--- PASS: TestAccDatadogMonitor_Basic (83.98s)
=== RUN   TestAccDatadogMonitor_BasicNoTreshold
--- PASS: TestAccDatadogMonitor_BasicNoTreshold (80.02s)
=== RUN   TestAccDatadogMonitor_Updated
--- PASS: TestAccDatadogMonitor_Updated (65.84s)
=== RUN   TestAccDatadogMonitor_TrimWhitespace
--- PASS: TestAccDatadogMonitor_TrimWhitespace (73.53s)
=== RUN   TestAccDatadogMonitor_Basic_float_int
--- PASS: TestAccDatadogMonitor_Basic_float_int (78.68s)
=== RUN   TestAccDatadogTimeboard_update
--- PASS: TestAccDatadogTimeboard_update (82.39s)
=== RUN   TestValidateAggregatorMethod
--- PASS: TestValidateAggregatorMethod (0.00s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/datadog	549.100s

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