provider/google: atomic Cloud DNS record changes

[billf]

Closes #6129

[billf]

cc: @evandbrown

[stack72]

Hi @billf

This LGTM! Thanks for the contribution here :)

% make testacc TEST=./builtin/providers/google TESTARGS='-run=TestAccDnsRecordSet_'                                           1 ↵
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/08 12:30:39 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/google -v -run=TestAccDnsRecordSet_ -timeout 120m
=== RUN   TestAccDnsRecordSet_basic
--- PASS: TestAccDnsRecordSet_basic (44.18s)
=== RUN   TestAccDnsRecordSet_modify
--- PASS: TestAccDnsRecordSet_modify (89.34s)
=== RUN   TestAccDnsRecordSet_changeType
--- PASS: TestAccDnsRecordSet_changeType (64.72s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/google 198.265s

[ghost]

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