Refactor registrar area domain form

#270

app/views/registrar/domains/_form.haml

@@ -3,10 +3,10 @@
   .row
     .col-md-8
       #general-tab.tab-pane.active
-        = render 'registrar/domains/form_partials/general'
-        = render 'registrar/domains/form_partials/contacts'
-        = render 'registrar/domains/form_partials/nameservers'
-        = render 'registrar/domains/form_partials/dnskeys'
+        = render 'registrar/domains/form/general'
+        = render 'registrar/domains/form/contacts'
+        = render 'registrar/domains/form/nameservers'
+        = render 'registrar/domains/form/dnskeys'
 
       .panel.panel-default
         .panel-heading.clearfix