Make gpg.receive_keys report failure when GPG does

This makes `gpg.present` report the correct result when a
keyserver is unreachable and thus fixes issue 65169 in
concert with several related fixes in this branch.

changelog/65169.fixed.md

@@ -0,0 +1 @@
+Fixed `gpg.present` succeeds when the keyserver is unreachable

salt/modules/gpg.py

@@ -934,21 +934,20 @@ def receive_keys(keyserver=None, keys=None, user=None, gnupghome=None):
                 if "ok" in result:
                     if result["ok"] == "1":
                         ret["message"].append(
-                            "Key {} added to keychain".format(result["fingerprint"])
+                            f"Key {result['fingerprint']} added to keychain"
                         )
                     elif result["ok"] == "0":
                         ret["message"].append(
-                            "Key {} already exists in keychain".format(
-                                result["fingerprint"]
-                            )
+                            f"Key {result['fingerprint']} already exists in keychain"
                         )
                 elif "problem" in result:
-                    ret["message"].append("Unable to add key to keychain")
-        elif not bool(recv_data):
+                    ret["message"].append(
+                        f"Unable to add key to keychain: {result.get('text', 'No further description')}"
+                    )
+
+        if not bool(recv_data):
             ret["res"] = False
-            ret["message"] = [
-                f"Something went wrong during gpg call: {recv_data.stderr}"
-            ]
+            ret["message"].append(f"GPG reported failure: {recv_data.stderr}")
     except AttributeError:
         ret["res"] = False
         ret["message"] = ["Invalid return from python-gpg"]