Update state setting of iec network acl

[Lance52259]

Community Node

This revison mainly solves the following problems:

• add networks satate setting when reading resource data from server.
• update test with import check

fixes #871

Release note for CHANGELOG:

NONE

Output from acceptance testing:

make testacc TEST='./huaweicloud' TESTARGS='-run=TestAccIecNetworkACLResource_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud -v -run=TestAccIecNetworkACLResource_basic -timeout 360m -parallel 4
=== RUN   TestAccIecNetworkACLResource_basic
=== PAUSE TestAccIecNetworkACLResource_basic
=== CONT  TestAccIecNetworkACLResource_basic
--- PASS: TestAccIecNetworkACLResource_basic (70.75s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud       70.796s