chore(servicestage/auth): host parameter is no longer required

[Lance52259]

What this PR does / why we need it:
During the OpenAPI upgradation, the behavior of parameter host is changed from required to optional.

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:

1. update the behavior of the parameter host from required to optional.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o servicestage -f TestAccRepoTokenAuth_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/servicestage" -v -coverprofile="./huaweicloud/services/acceptance/servicestage/servicestage_coverage.cov" -coverpkg="./huaweicloud/services/servicestage" -run TestAccRepoTokenAuth_basic -timeout 360m -parallel 10
=== RUN   TestAccRepoTokenAuth_basic
=== PAUSE TestAccRepoTokenAuth_basic
=== CONT  TestAccRepoTokenAuth_basic
--- PASS: TestAccRepoTokenAuth_basic (10.58s)
PASS
coverage: 3.9% of statements in ./huaweicloud/services/servicestage
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/servicestage      10.630s coverage: 3.9% of statements in ./huaweicloud/services/servicestage

• 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 <<<<<<

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @Lance52259

[Lance52259]

./scripts/coverage.sh -o servicestage -f TestAccRepoTokenAuth_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/servicestage" -v -coverprofile="./huaweicloud/services/acceptance/servicestage/servicestage_coverage.cov" -coverpkg="./huaweicloud/services/servicestage" -run TestAccRepoTokenAuth_basic -timeout 360m -parallel 10
=== RUN   TestAccRepoTokenAuth_basic
=== PAUSE TestAccRepoTokenAuth_basic
=== CONT  TestAccRepoTokenAuth_basic
--- PASS: TestAccRepoTokenAuth_basic (12.71s)
PASS
coverage: 3.9% of statements in ./huaweicloud/services/servicestage
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/servicestage      12.757s coverage: 3.9% of statements in ./huaweicloud/services/servicestage

[deer-hang]

remove variable repository_host.

[Lance52259]

done.

[deer-hang]

/lgtm