template_to_instance properly includes snode for creation.

template_to_instance now raises a RuntimeError if drdb is set but no snode is
set.

refs #13791
VMWizardAdvanced now prevents snode == pnode

refs #13791
Add test for VMWizardAdvancedForm with same pnode as snode

refs #13791
Merge branch 'bug/13791' into release/0.10.1