Handle server id mismatch

Handle the corner case where a returned server id
may not match the id in the current terraform state.
This should never happen because id's are immutable.

If it does ever occur we will not overwrite any state
and will instead raise this error:

```
Error: error reading server

  with hpegl_pc_server.test,
  on terraform_plugin_test.tf line 21, in resource "hpegl_pc_server" "test":
  21:   resource "hpegl_pc_server" "test" {

'id' mismatch: 697e8cbf-df7e-570c-a3c7-912d4ce8375a !=
697e8cbf-df7e-570c-a3c7-912d4ce8375a
```

internal/resources/server/resource.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/HewlettPackard/hpegl-pcbe-terraform-resources/internal/client"
 	"github.com/HewlettPackard/hpegl-pcbe-terraform-resources/internal/sdk/systems/privatecloudbusiness"
@@ -101,6 +102,17 @@ func doRead(
 		return
 	}
 
+	if *(server.GetId()) != serverID {
+		(*diagsP).AddError(
+			"error reading server",
+			fmt.Sprintf("'id' mismatch: %s != %s",
+				*(server.GetId()), serverID,
+			),
+		)
+
+		return
+	}
+
 	if server.GetName() == nil {
 		(*diagsP).AddError(
 			"error reading server",