feat(dws/cluster): the cluster resource supports scale-in nodes

[wuzhuanhong]

What this PR does / why we need it:
The resource support scaling-in nodes.

Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

• Tests added/passed.

make testacc TEST=./huaweicloud/services/acceptance/dws TESTARGS='-run TestAccResourceCluster_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/dws -v -run TestAccResourceCluster_ -timeout 360m -parallel 4
=== RUN   TestAccResourceCluster_basicV1
=== PAUSE TestAccResourceCluster_basicV1
=== RUN   TestAccResourceCluster_basicV2
=== PAUSE TestAccResourceCluster_basicV2
=== RUN   TestAccResourceCluster_basicV2_mutilAZs
=== PAUSE TestAccResourceCluster_basicV2_mutilAZs
=== CONT  TestAccResourceCluster_basicV1
=== CONT  TestAccResourceCluster_basicV2
=== CONT  TestAccResourceCluster_basicV2_mutilAZs
    acceptance.go:2051: HW_DWS_MUTIL_AZS must be set for the acceptance test
--- SKIP: TestAccResourceCluster_basicV2_mutilAZs (0.01s)
--- PASS: TestAccResourceCluster_basicV1 (3195.04s)
--- PASS: TestAccResourceCluster_basicV2 (4001.53s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/dws       4001.581s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

[wuzhuanhong]

make testacc TEST=./huaweicloud/services/acceptance/dws TESTARGS='-run TestAccResourceCluster_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/dws -v -run TestAccResourceCluster_ -timeout 360m -parallel 4
=== RUN TestAccResourceCluster_basicV1
=== PAUSE TestAccResourceCluster_basicV1
=== RUN TestAccResourceCluster_basicV2
=== PAUSE TestAccResourceCluster_basicV2
=== RUN TestAccResourceCluster_basicV2_mutilAZs
=== PAUSE TestAccResourceCluster_basicV2_mutilAZs
=== CONT TestAccResourceCluster_basicV1
=== CONT TestAccResourceCluster_basicV2_mutilAZs
=== CONT TestAccResourceCluster_basicV2
=== CONT TestAccResourceCluster_basicV2_mutilAZs
acceptance.go:2164: HW_DWS_MUTIL_AZS must be set for the acceptance test
--- SKIP: TestAccResourceCluster_basicV2_mutilAZs (0.00s)
--- PASS: TestAccResourceCluster_basicV1 (3237.70s)
--- PASS: TestAccResourceCluster_basicV2 (3759.10s)
PASS
ok github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/dws 3759.176s

[WangLiNaruto]

LGTM