Fixes: #12494
The Create was changed to use the default and not d.GetOk - the update
wasn't - this was causing issues when trying to update to a false value
```
% make testacc TEST=./builtin/providers/datadog
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/07 16:20:54 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/datadog -v -timeout 120m
=== RUN TestDatadogMonitor_import
--- PASS: TestDatadogMonitor_import (4.77s)
=== RUN TestDatadogUser_import
--- PASS: TestDatadogUser_import (6.23s)
=== RUN TestProvider
--- PASS: TestProvider (0.00s)
=== RUN TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN TestAccDatadogMonitor_Basic
--- PASS: TestAccDatadogMonitor_Basic (3.83s)
=== RUN TestAccDatadogMonitor_BasicNoTreshold
--- PASS: TestAccDatadogMonitor_BasicNoTreshold (4.92s)
=== RUN TestAccDatadogMonitor_Updated
--- PASS: TestAccDatadogMonitor_Updated (5.88s)
=== RUN TestAccDatadogMonitor_TrimWhitespace
--- PASS: TestAccDatadogMonitor_TrimWhitespace (3.23s)
=== RUN TestAccDatadogMonitor_Basic_float_int
--- PASS: TestAccDatadogMonitor_Basic_float_int (5.73s)
=== RUN TestAccDatadogTimeboard_update
--- PASS: TestAccDatadogTimeboard_update (8.86s)
=== RUN TestValidateAggregatorMethod
--- PASS: TestValidateAggregatorMethod (0.00s)
=== RUN TestAccDatadogUser_Updated
--- PASS: TestAccDatadogUser_Updated (6.05s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/datadog 49.506s
```
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