provider/fastly: Add support for Conditions for Fastly Services

[catsby]

Add support for working with Conditions in Fastly Services. Many of the other objects (backends, gzips, etc) will be able to reference these conditions by adding/exposing _condition attributes to them, but I'll do that in a future patch to minimize what's changing in this PR

Docs here:

• https://docs.fastly.com/guides/conditions/

[jen20]

Acceptance test run:

make testacc TEST=./builtin/providers/fastly
==> Checking that code complies with gofmt requirements...
/Users/James/Code/go/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/fastly -v  -timeout 120m
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccFastlyServiceV1_conditional_basic
--- PASS: TestAccFastlyServiceV1_conditional_basic (8.25s)
=== RUN   TestFastlyServiceV1_FlattenGzips
--- PASS: TestFastlyServiceV1_FlattenGzips (0.00s)
=== RUN   TestAccFastlyServiceV1_gzips_basic
--- PASS: TestAccFastlyServiceV1_gzips_basic (19.58s)
=== RUN   TestFastlyServiceV1_BuildHeaders
--- PASS: TestFastlyServiceV1_BuildHeaders (0.00s)
=== RUN   TestAccFastlyServiceV1_headers_basic
--- PASS: TestAccFastlyServiceV1_headers_basic (19.42s)
=== RUN   TestAccFastlyServiceV1_s3logging_basic
--- PASS: TestAccFastlyServiceV1_s3logging_basic (19.05s)
=== RUN   TestAccFastlyServiceV1_s3logging_s3_env
--- PASS: TestAccFastlyServiceV1_s3logging_s3_env (7.45s)
=== RUN   TestResourceFastlyFlattenDomains
--- PASS: TestResourceFastlyFlattenDomains (0.00s)
=== RUN   TestResourceFastlyFlattenBackend
--- PASS: TestResourceFastlyFlattenBackend (0.00s)
=== RUN   TestAccFastlyServiceV1_updateDomain
--- PASS: TestAccFastlyServiceV1_updateDomain (20.42s)
=== RUN   TestAccFastlyServiceV1_updateBackend
--- PASS: TestAccFastlyServiceV1_updateBackend (20.52s)
=== RUN   TestAccFastlyServiceV1_basic
--- PASS: TestAccFastlyServiceV1_basic (7.21s)
=== RUN   TestAccFastlyServiceV1_disappears
--- PASS: TestAccFastlyServiceV1_disappears (4.86s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/fastly 126.769s

[catsby]

Thanks!

[ghost]

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