provider/google: Add support for using source_disk to google_compute_image

[cblecker]

Fixes #9262.

Allows you to use an existing disk resource to then funnel back to an image resource.

$ make testacc TEST=./builtin/providers/google TESTARGS='-run=TestAccComputeImage...'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/10/26 01:09:22 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/google -v -run=TestAccComputeImage... -timeout 120m
=== RUN   TestAccComputeImage_basic
--- PASS: TestAccComputeImage_basic (79.13s)
=== RUN   TestAccComputeImage_basedondisk
--- PASS: TestAccComputeImage_basedondisk (104.79s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/google 183.926s

[stack72]

LGTM! Thanks :)

% make testacc TEST=./builtin/providers/google TESTARGS='-run=TestAccComputeImage'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/11/01 10:29:19 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/google -v -run=TestAccComputeImage -timeout 120m
=== RUN   TestAccComputeImage_basic
--- PASS: TestAccComputeImage_basic (70.52s)
=== RUN   TestAccComputeImage_basedondisk
--- PASS: TestAccComputeImage_basedondisk (82.31s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/google 152.850s

[ghost]

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