updated tests to reload nodes after the tree is altered in all tree models, not only NS
updated tests to reload nodes after the tree is altered in all tree models, not only NS

Ernsting/django-treebeard,kazmiruk/django-treebeard,Ernsting/django-treebeard,Ernsting/django-treebeard,albedoweb/django-treebeard,albedoweb/django-treebeard,kazmiruk/django-treebeard,kazmiruk/django-treebeard,albedoweb/django-treebeard,velfimov/django-treebeard,velfimov/django-treebeard,torchbox/django-treebeard,albedoweb/django-treebeard,velfimov/django-treebeard,velfimov/django-treebeard,kazmiruk/django-treebeard,torchbox/django-treebeard,torchbox/django-treebeard