states/statefile: decode backend hash as uint64

[minamijoyo]

Fixes #21478

In #19688, terraform.BackendState.Hash was fixed.
We also need to fix states/statefile.backendStateV2.Hash

before

[terraform@fix-statev2-hash-decode|✔]$ go test -v ./states/statefile -run TestRoundtrip
=== RUN   TestRoundtrip
=== RUN   TestRoundtrip/v1-simple
2019/05/28 23:58:38 [TRACE] statefile.Read: upgrading format from v1 to v2
2019/05/28 23:58:38 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:58:38 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
2019/05/28 23:58:38 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:58:38 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
2019/05/28 23:58:38 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:58:38 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
=== RUN   TestRoundtrip/v3-bigint
=== RUN   TestRoundtrip/v3-grabbag
=== RUN   TestRoundtrip/v3-simple
=== RUN   TestRoundtrip/v4-simple
--- FAIL: TestRoundtrip (0.01s)
    --- PASS: TestRoundtrip/v1-simple (0.00s)
    --- FAIL: TestRoundtrip/v3-bigint (0.00s)
        roundtrip_test.go:53: unexpected error: Invalid state file format: The state file field "hash" has invalid value number 10669755453527594976
    --- PASS: TestRoundtrip/v3-grabbag (0.00s)
    --- PASS: TestRoundtrip/v3-simple (0.00s)
    --- PASS: TestRoundtrip/v4-simple (0.00s)
FAIL
FAIL    github.com/hashicorp/terraform/states/statefile 0.024s

after

[terraform@fix-statev2-hash-decode|✔]$ go test -v ./states/statefile -run TestRoundtrip
=== RUN   TestRoundtrip
=== RUN   TestRoundtrip/v1-simple
2019/05/28 23:57:07 [TRACE] statefile.Read: upgrading format from v1 to v2
2019/05/28 23:57:07 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:57:07 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
2019/05/28 23:57:07 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:57:07 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
2019/05/28 23:57:07 [STATE UPGRADE] Detected the following collections in state: [triggers.]
2019/05/28 23:57:07 [STATE UPGRADE] Detected triggers as a map. Replaced count = 1
=== RUN   TestRoundtrip/v3-bigint
=== RUN   TestRoundtrip/v3-grabbag
=== RUN   TestRoundtrip/v3-simple
=== RUN   TestRoundtrip/v4-simple
--- PASS: TestRoundtrip (0.01s)
    --- PASS: TestRoundtrip/v1-simple (0.00s)
    --- PASS: TestRoundtrip/v3-bigint (0.00s)
    --- PASS: TestRoundtrip/v3-grabbag (0.00s)
    --- PASS: TestRoundtrip/v3-simple (0.00s)
    --- PASS: TestRoundtrip/v4-simple (0.00s)
PASS
ok      github.com/hashicorp/terraform/states/statefile (cached)

[minamijoyo]

This file was copied from v3-grabbag.in.tfstate and the following lines are added.

[terraform@fix-statev2-hash-decode|✔]$ diff -u states/statefile/testdata/roundtrip/{v3-grabbag.in.tfstate,v3-bigint.in.tfstate}
--- states/statefile/testdata/roundtrip/v3-grabbag.in.tfstate   2018-12-13 11:18:13.000000000 +0900
+++ states/statefile/testdata/roundtrip/v3-bigint.in.tfstate    2019-05-28 23:56:58.000000000 +0900
@@ -3,6 +3,9 @@
     "terraform_version": "0.11.1",
     "serial": 8,
     "lineage": "0f5b2ff9-6ff5-8e9e-1f81-aa3ce9a483eb",
+    "backend": {
+        "hash": 10669755453527594976
+    },
     "modules": [
         {
             "path": [

[minamijoyo]

This file was only copied from v3-grabbag.out.tfstate

[ghost]

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