Fix Drupal installation in svn mode

tasks/install/svn.yml

 ---
 # file: roles/drupal/tasks/install/svn.yml
 
+- name: "Remove Drupal Root Directory"
+  file:
+    path='{{ docRoot }}'
+    state='absent'
+
 - name: "Install and update Drupal trees from SVN"
   subversion:
     repo='{{ drupal.src.url }}'
-    dest='{{ drupalRoot }}'
+    dest='{{ webRoot }}{{ drupal.src.target }}'
     force=yes
   become: no