Changed the become_method field into one that takes arbitrary input

related #2630

Signed-off-by: Jeff Bradberry <jeff.bradberry@gmail.com>

awx/main/fields.py

@@ -4,7 +4,6 @@
 # Python
 import copy
 import json
-import operator
 import re
 import urllib.parse
 
@@ -45,7 +44,7 @@ from awx.main.utils.filters import SmartFilter
 from awx.main.utils.encryption import encrypt_value, decrypt_value, get_encryption_key
 from awx.main.validators import validate_ssh_private_key
 from awx.main.models.rbac import batch_role_ancestor_rebuilding, Role
-from awx.main.constants import CHOICES_PRIVILEGE_ESCALATION_METHODS, ENV_BLACKLIST
+from awx.main.constants import ENV_BLACKLIST
 from awx.main import utils
 
 
@@ -512,8 +511,7 @@ class CredentialInputField(JSONSchemaField):
         for field in model_instance.credential_type.inputs.get('fields', []):
             field = field.copy()
             if field['type'] == 'become_method':
-                field.pop('type')
-                field['choices'] = list(map(operator.itemgetter(0), CHOICES_PRIVILEGE_ESCALATION_METHODS))
+                field['type'] = 'string'
             properties[field['id']] = field
             if field.get('choices', []):
                 field['enum'] = list(field['choices'])[:]
@@ -725,9 +723,6 @@ class CredentialTypeInputField(JSONSchemaField):
                         code='invalid',
                         params={'value': value},
                     )
-                else:
-                    field.pop('type')
-                    field['choices'] = CHOICES_PRIVILEGE_ESCALATION_METHODS
 
             for key in ('choices', 'multiline', 'format', 'secret',):
                 if key in field and field['type'] != 'string':