support specifying multiple vault IDs for a playbook run

see: https://github.com/ansible/awx/issues/352

awx/main/migrations/0009_v330_multi_credential.py

@@ -4,6 +4,7 @@ from __future__ import unicode_literals
 from django.db import migrations, models
 
 from awx.main.migrations import _migration_utils as migration_utils
+from awx.main.migrations import _credentialtypes as credentialtypes
 from awx.main.migrations._multi_cred import migrate_to_multi_cred
 
 
@@ -50,4 +51,5 @@ class Migration(migrations.Migration):
             model_name='jobtemplate',
             name='vault_credential',
         ),
+        migrations.RunPython(credentialtypes.add_vault_id_field)
     ]

awx/main/migrations/_credentialtypes.py

@@ -173,3 +173,8 @@ def migrate_job_credentials(apps, schema_editor):
     finally:
         utils.get_current_apps = orig_current_apps
 
+
+def add_vault_id_field(apps, schema_editor):
+    vault_credtype = CredentialType.objects.get(kind='vault')
+    vault_credtype.inputs = CredentialType.defaults.get('vault')().inputs
+    vault_credtype.save()