grenade-dsvm-ironic: Move task 'legacy workspace dir' to first

It seems another task is put before the creation of
workspace directory causing:
'No such file or directoty: /home/zuul/workspace'

Change-Id: I4741f9bcd8709aaa3b26f28f3c427cd07e99c1a7

playbooks/legacy/grenade-dsvm-ironic/run.yaml

@@ -2,6 +2,11 @@
   name: Autoconverted job legacy-grenade-dsvm-ironic from old job gate-grenade-dsvm-ironic-ubuntu-xenial-nv
   tasks:
 
+    - name: Ensure legacy workspace directory
+      file:
+        path: '{{ ansible_user_dir }}/workspace'
+        state: directory
+
     - name: Show the environment
       shell:
         cmd: |
@@ -10,11 +15,6 @@
         chdir: '{{ ansible_user_dir }}/workspace'
       environment: '{{ zuul | zuul_legacy_vars }}'
 
-    - name: Ensure legacy workspace directory
-      file:
-        path: '{{ ansible_user_dir }}/workspace'
-        state: directory
-
     - shell:
         cmd: |
           set -e