feat(WAF): waf reference table support epsID

[deer-hang]

What this PR does / why we need it:

• waf reference support epsid
  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.
• Documentation updated.
• Schema updated.

Acceptance Steps Performed

make testacc TEST='./huaweicloud/services/acceptance/waf' TESTARGS='-run TestAccWafReferenceTableV1_'

==> Checking that code complies with gofmt requirements... 
TF_ACC=1 go test ./huaweicloud/services/acceptance/waf -v -run TestAccWafReferenceTableV1_ -timeout 360m -parallel 4 
=== RUN   TestAccWafReferenceTableV1_basic 
=== PAUSE TestAccWafReferenceTableV1_basic 
=== RUN   TestAccWafReferenceTableV1_withEpsID
=== PAUSE TestAccWafReferenceTableV1_withEpsID
=== CONT  TestAccWafReferenceTableV1_basic
=== CONT  TestAccWafReferenceTableV1_withEpsID 
--- PASS: TestAccWafReferenceTableV1_basic (361.38s) 
--- PASS: TestAccWafReferenceTableV1_withEpsID (369.74s) 
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/waf       370.030s

make testacc TEST='./huaweicloud/services/acceptance/waf' TESTARGS='-run TestAccDataSourceReferenceTablesV1_'

==> Checking that code complies with gofmt requirements... 
TF_ACC=1 go test ./huaweicloud/services/acceptance/waf -v -run TestAccDataSourceReferenceTablesV1_ -timeout 360m -parallel 4 
=== RUN   TestAccDataSourceReferenceTablesV1_basic 
--- PASS: TestAccDataSourceReferenceTablesV1_basic (357.52s) 
=== RUN   TestAccDataSourceReferenceTablesV1_withEpsID
--- PASS: TestAccDataSourceReferenceTablesV1_withEpsID (364.06s) 
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/waf       721.721s

[houpeng80]

/lgtm

[Jason-Zhang9309]

/lgtm