soft deletes available for applications and environments

- parent relation will not include applications or environments marked
  as deleted
- domain classes will exclude deleted objects from selections
- changed some test factories to use domain_word for resource names,
  because they were using person names and it bugged me

tests/factories.py

@@ -105,7 +105,7 @@ class PortfolioFactory(Base):
     class Meta:
         model = Portfolio
 
-    name = factory.Faker("name")
+    name = factory.Faker("domain_word")
     defense_component = factory.LazyFunction(random_service_branch)
 
     @classmethod
@@ -157,7 +157,7 @@ class ApplicationFactory(Base):
         model = Application
 
     portfolio = factory.SubFactory(PortfolioFactory)
-    name = factory.Faker("name")
+    name = factory.Faker("domain_word")
     description = "A test application"
 
     @classmethod
@@ -192,6 +192,8 @@ class EnvironmentFactory(Base):
     class Meta:
         model = Environment
 
+    name = factory.Faker("domain_word")
+
     @classmethod
     def _create(cls, model_class, *args, **kwargs):
         with_members = kwargs.pop("members", [])