Make field validation to be conditional.

Introduce new field attribute 'enabled' - true by default, but if it
is false, then the field won't be validated, only coerced to Python
type. This actually solves the issue with hidden (and disabled) fields
which don't validate and prevent proceeding to next step.

Change-Id: Ie57fa4731792ed1e44e9f61fa5cb6a16ddaf3109
Fixes: bug MRN-883

muranodashboard/panel/services/fields.py

@@ -38,7 +38,14 @@ def with_request(func):
     return update
 
 
-class CustomPropertiesField(object):
+class CustomPropertiesField(forms.Field):
+    def clean(self, value):
+        """Skip all validators if field is disabled."""
+        if getattr(self, 'enabled', True):
+            return super(CustomPropertiesField, self).clean(value)
+        else:
+            return super(CustomPropertiesField, self).to_python(value)
+
     @classmethod
     def push_properties(cls, kwargs):
         props = {}

muranodashboard/panel/services/forms.py

@@ -253,7 +253,8 @@ class ServiceConfigurationForm(UpdatableFieldsForm):
                 raise forms.ValidationError(error_messages)
 
             for name, field in self.fields.iteritems():
-                if isinstance(field, fields.PasswordField):
+                if (isinstance(field, fields.PasswordField) and
+                        getattr(field, 'enabled', True)):
                     field.compare(name, cleaned_data)
 
                 if hasattr(field, 'postclean'):

muranodashboard/services/MsSqlClusterServer.yaml

@@ -58,18 +58,18 @@ forms:
         - name: domainAdminUserName
           type: string
           label: Active Directory User
-          required: {YAQL: $.serviceConfiguration.externalAD}
+          enabled: {YAQL: $.serviceConfiguration.externalAD}
           regexpValidator: '^[-\w]+$'
           errorMessages:
-            invalid: 'Just letters, numbers, underscores and hyphens are allowed.'
+            invalid: Just letters, numbers, underscores and hyphens are allowed.
         - name: domainAdminPassword
           type: password
           label: Active Directory Password
-          required: {YAQL: $.serviceConfiguration.externalAD}
+          enabled: {YAQL: $.serviceConfiguration.externalAD}
         - name: domain
           type: domain
           label: Domain
-          required: {YAQL: not $.serviceConfiguration.externalAD}
+          enabled: {YAQL: not $.serviceConfiguration.externalAD}
           description: >-
             Service can be joined to the Active Directory domain. If you want to 
             create an AD domain create the AD Service first.
@@ -89,7 +89,7 @@ forms:
           label: SA Password
           description: Set system administrator password for the MS SQL Server.
           helpText: SQL server System Administrator account
-          required: {YAQL: $.serviceConfiguration.mixedModeAuth}
+          enabled: {YAQL: $.serviceConfiguration.mixedModeAuth}
   - clusterConfiguration:
       fields:
         - name: clusterIP