add docs for dns zone & record import

Author: shubinmi

docs/resources/gcore_dns_zone.md

@@ -38,4 +38,11 @@ resource "gcore_dns_zone" "example_zone" {
 
 - **id** (String) The ID of this resource.
 
+## Import
 
+Import is supported using the following syntax:
+
+```shell
+# import using zone name format
+terraform import gcore_dns_zone.example_zone example_zone.com
+```

docs/resources/gcore_dns_zone_record.md

@@ -136,4 +136,11 @@ Optional:
 - **limit** (Number) A DNS Zone Record filter option that describe how many records will be percolated.
 - **strict** (Boolean) A DNS Zone Record filter option that describe possibility to return answers if no records were percolated through filter.
 
+## Import
 
+Import is supported using the following syntax:
+
+```shell
+# import using zone:domain:type format
+terraform import gcore_dns_zone_record.example_rrset0 example.com:domain.example.com:A
+```

examples/resources/gcore_dns_zone/import.sh

@@ -0,0 +1,2 @@
+# import using zone name format
+terraform import gcore_dns_zone.example_zone example_zone.com

examples/resources/gcore_dns_zone_record/import.sh

@@ -0,0 +1,2 @@
+# import using zone:domain:type format
+terraform import gcore_dns_zone_record.example_rrset0 example.com:domain.example.com:A

gcore/resource_gcore_dns_zone_record.go

@@ -238,7 +238,18 @@ func resourceDNSZoneRecord() *schema.Resource {
 		DeleteContext: checkDNSDependency(resourceDNSZoneRecordDelete),
 		Description:   "Represent DNS Zone Record resource. https://dns.gcorelabs.com/zones",
 		Importer: &schema.ResourceImporter{
-			StateContext: schema.ImportStatePassthroughContext,
+			StateContext: func(ctx context.Context, d *schema.ResourceData, meta interface{}) ([]*schema.ResourceData, error) {
+				parts := strings.Split(d.Id(), ":")
+				if len(parts) != 3 {
+					return nil, fmt.Errorf("format must be as zone:domain:type")
+				}
+				_ = d.Set(DNSZoneRecordSchemaZone, parts[0])
+				d.SetId(parts[0])
+				_ = d.Set(DNSZoneRecordSchemaDomain, parts[1])
+				_ = d.Set(DNSZoneRecordSchemaType, parts[2])
+
+				return []*schema.ResourceData{d}, nil
+			},
 		},
 	}
 }