chore(sweeper): add sweeper base function

[hmbig2]

What this PR does / why we need it:

1. add sweeper base function
2. add vpc sweeper

Which issue this PR fixes: (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged) fixes #1951

Special notes for your reviewer:

Release note:

PR Checklist

• [ ] Tests added/passed.
• [ ] Documentation updated.
• [ ] Schema updated.

Acceptance Steps Performed

go test ./huaweicloud/services/acceptance/sweep -v  -sweep=cn-north-4 -sweep-run=huaweicloud_vpc  -sweep-allow-failures=true
2022/02/15 11:23:55 [DEBUG] Completed Sweeper (huaweicloud_vpc_subnet) in region (cn-north-4) in 454.1145ms
2022/02/15 11:23:55 [DEBUG] Running Sweeper (huaweicloud_vpc) in region (cn-north-4)
2022/02/15 11:23:55 [DEBUG] Completed Sweeper (huaweicloud_vpc) in region (cn-north-4) in 5.9µs
2022/02/15 11:23:55 [DEBUG] Sweeper (huaweicloud_vpc_subnet) already ran in region (cn-north-4)
2022/02/15 11:23:55 Completed Sweepers for region (cn-north-4) in 454.2272ms
2022/02/15 11:23:55 Sweeper Tests for region (cn-north-4) ran successfully:
        - huaweicloud_vpc_subnet
        - huaweicloud_vpc
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/sweep     2.939s