resource/aws_network_acl: Ensure tags are handled on creation
resource/aws_network_acl: Ensure tags are handled on creation

Previously:

```
--- FAIL: TestAccAWSNetworkAcl_basic (7.89s)
    testing.go:669: Step 0 error: After applying this step, the plan was not empty:

        DIFF:

        UPDATE: aws_network_acl.test
...
          tags.Name:                 "" => "tf-acc-acl-egress-and-ingress"
...
```

Output from acceptance testing:

```
--- PASS: TestAccAWSNetworkAcl_basic (44.83s)
--- PASS: TestAccAWSNetworkAcl_CaseSensitivityNoChanges (45.84s)
--- PASS: TestAccAWSNetworkAcl_disappears (41.71s)
--- PASS: TestAccAWSNetworkAcl_Egress_ConfigMode (80.98s)
--- PASS: TestAccAWSNetworkAcl_EgressAndIngressRules (40.63s)
--- PASS: TestAccAWSNetworkAcl_espProtocol (43.41s)
--- PASS: TestAccAWSNetworkAcl_Ingress_ConfigMode (74.98s)
--- PASS: TestAccAWSNetworkAcl_ipv6ICMPRules (31.16s)
--- PASS: TestAccAWSNetworkAcl_ipv6Rules (38.52s)
--- PASS: TestAccAWSNetworkAcl_ipv6VpcRules (37.93s)
--- PASS: TestAccAWSNetworkAcl_OnlyEgressRules (37.58s)
--- PASS: TestAccAWSNetworkAcl_OnlyIngressRules_basic (39.35s)
--- PASS: TestAccAWSNetworkAcl_OnlyIngressRules_update (63.18s)
--- PASS: TestAccAWSNetworkAcl_SubnetChange (60.24s)
--- PASS: TestAccAWSNetworkAcl_Subnets (69.00s)
--- PASS: TestAccAWSNetworkAcl_SubnetsDelete (67.02s)

--- PASS: TestAccAWSNetworkAclRule_allProtocol (57.73s)
--- PASS: TestAccAWSNetworkAclRule_basic (42.24s)
--- PASS: TestAccAWSNetworkAclRule_disappears (45.36s)
--- PASS: TestAccAWSNetworkAclRule_disappears_NetworkAcl (41.05s)
--- PASS: TestAccAWSNetworkAclRule_ingressEgressSameNumberDisappears (46.62s)
--- PASS: TestAccAWSNetworkAclRule_ipv6 (42.03s)
--- PASS: TestAccAWSNetworkAclRule_ipv6ICMP (36.46s)
--- PASS: TestAccAWSNetworkAclRule_ipv6VpcAssignGeneratedIpv6CidrBlockUpdate (58.86s)
--- PASS: TestAccAWSNetworkAclRule_missingParam (20.95s)
```

terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws