Update hostname from required to default_from_api (#8002) (#5670)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/8002.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+gkeonprem: updated `hostname` field of ip_block from required to optional from resource `google_gkeonprem_vmware_cluster` 
+```

google-beta/resource_gkeonprem_vmware_cluster.go

@@ -545,16 +545,17 @@ used for VMware user clusters.`,
 													Description: `The node's network configurations used by the VMware User Cluster.`,
 													Elem: &schema.Resource{
 														Schema: map[string]*schema.Schema{
-															"hostname": {
-																Type:        schema.TypeString,
-																Required:    true,
-																Description: `Hostname of the machine. VM's name will be used if this field is empty.`,
-															},
 															"ip": {
 																Type:        schema.TypeString,
 																Required:    true,
 																Description: `IP could be an IP address (like 1.2.3.4) or a CIDR (like 1.2.3.0/24).`,
 															},
+															"hostname": {
+																Type:        schema.TypeString,
+																Computed:    true,
+																Optional:    true,
+																Description: `Hostname of the machine. VM's name will be used if this field is empty.`,
+															},
 														},
 													},
 												},

website/docs/r/gkeonprem_vmware_cluster.html.markdown

@@ -447,7 +447,7 @@ The following arguments are supported:
   IP could be an IP address (like 1.2.3.4) or a CIDR (like 1.2.3.0/24).
 
 * `hostname` -
-  (Required)
+  (Optional)
   Hostname of the machine. VM's name will be used if this field is empty.
 
 <a name="nested_dhcp_ip_config"></a>The `dhcp_ip_config` block supports: