Allow home path expansion on GCP service account files (#44863)

* Allowing home path expansion on GCP service account files #42974

* wrong name for changelog

changelogs/fragments/gcp_service_account_home_path.yaml

@@ -0,0 +1,2 @@
+minor_changes:
+  - GCP Modules will do home path expansion on service account file paths

lib/ansible/module_utils/gcp_utils.py

@@ -129,8 +129,8 @@ class GcpSession(object):
             credentials, project_id = google.auth.default()
             return credentials
         elif cred_type == 'serviceaccount':
-            return service_account.Credentials.from_service_account_file(
-                self.module.params['service_account_file'])
+            path = os.path.realpath(os.path.expanduser(self.module.params['service_account_file']))
+            return service_account.Credentials.from_service_account_file(path)
         elif cred_type == 'machineaccount':
             return google.auth.compute_engine.Credentials(
                 self.module.params['service_account_email'])